On the Provision of Technical Safety for Selected Equipment

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1. ------IND- 2005 0154 CZ- EN- ------20050512 ------PROJET

D r a f t

DECREE

on the provision of technical safety for selected equipment

Pursuant to Section 47(7) implementing Section 2(nn), Section 4a(1), Section 4b(1) and Section 17(1)(m) of Act No. 18/1997 Coll. on the peaceful use of nuclear energy and ionising radiation (the Atomic Act) and amending certain Acts, as amended (hereinafter “the Act”), the State Office for Nuclear Safety hereby decrees:

Section 1

Object

This Decree governs

a)the method for determining selected equipment specially designed for nuclear facilities,

b)the technical requirements for the provision of technical safety for selected equipment during manufacture and operation,

c)the procedures for assessing the conformity of selected equipment specially designed for nuclear facilities with thetechnical requirements and

d)the method for providing technical safety for selected equipment in operation.

Section 2

Basic concepts

a)selected equipment specially designed for nuclear facilities (hereinafter “specially designed selected equipment”) shall mean selected equipment in safety classes[1)] 1, 2 and 3, the failure of which may give rise to a release of radioactive substances or ionising radiation and threaten human health,

b)pressure equipment shall mean specially designed selected equipment subjected to the pressure of a working medium, including elements attached to components exposed to pressure,

c)design pressure shall mean the maximum pressure used in designing the basic dimensions of pressure equipment, at which operation under normal operating conditions is permitted,

d)maximum permissible pressure shall mean the maximum pressure declared by a manufacturer, for which pressure equipment is designed,

e)design temperature shall mean the maximum temperature used in designing the basic dimensions of pressure equipment, at which operation under normal operating conditions is permitted,

f)part of selected equipment shall mean a part of selected equipment, the failure or faulty operation of which may threaten the technical safety of the equipment,

g)manufacture shall mean a process aimed at producing finished selected equipment, extending as far as commissioning, or the individual phases of it, including repairs to and reconstruction of selected equipment. Manufacture shall include in particular the phases of design, production of parts and erection or assembly of selected equipment from parts of selected equipment,

h)repair shall mean the exchange of selected equipment or parts manufactured, supplied and assembled in accordance with the technical documentation,

i)commissioning of selected equipment shall mean the moment when selected equipment is accepted and used by the holder of authorisation for the purpose for which it has been produced,

j)technical documentation shall mean a set of documents laid down by this Decree, in which the manufacturer documents the method of manufacture of specially designed selected equipment or parts and the method and extent of verification of its technical condition when in operation for the whole of its service life,

k)accompanying technical documentation shall mean a set of documents laid down by this Decree, in which the manufacturer documents the condition of specially designed selected equipment or parts after the completion of manufacture,

l)declaration of conformity shall mean a document, in which the manufacturer provides a declaration on the assessment of conformity of selected equipment with thetechnical requirements during the manufacture of such equipment.

Section 3

Method for determining specially designed selected equipment

(with respect to Section 4a(1) of the Act)

(1)Specially designed selected equipment shall be:

a)pressure equipment

forming the boundary of a coolant pressure circuit in a nuclear reactor assigned to safety class 1 including pressure vessels and steam generators operating with radioactive substances, the maximum permissible pressure of which exceeds 0.05MPa and the volume of which is greater than 10 litres, or pumps, pipes and fittings operating with radioactive substances with a maximum permissible pressure exceeding 0.05 MPa and an inside diameter of over DN 70,
assigned to safety classes 1, 2 and 3 used for reactor cooling, volume compensation and cooling systems for hermetically sealed spaces, normal and emergency filling systems, primary circuit cooling systems and cooling systems for equipment used for storing spent nuclear fuel operating with a maximum permissible pressure exceeding 0.05 MPa with an inside diameter of over DN 70,
cleaning systems for working media in nuclear equipment assigned to safety classes 2 and 3 (cleaning systems for working media in pressure circuits, operating with a maximum permissible pressure exceeding 0.05 MPa with an inside diameter of over DN 70),
structural parts of hermetically sealed containers sized for internal overpressure assigned to safety class 2, including equipment providing for hermetic sealing for a maximum design accident,
secondary circuits, assigned to safety classes 2 and 3, for which the design pressure for the working medium at a design temperature of over 100°C exceeds 4 MPa and the inside diameter of the pipes is over DN 200,

b)containers for the transportation and storage of spent nuclear fuel assigned to safety class 2.

(2)Specially designed selected equipment shall be differentiated in the list of selected equipment for given nuclear facilities.

Section 4

Technical requirements for the provision of technical safety applying during the manufacture of specially designed selected equipment

(with respect to Section 2(nn) and Section 4a(1) of the Act)

(1)In order to ensure technical safety, the manufacture of specially designed selected equipment shall be carried out so that the end results are in accordance with the technical requirements laid down by Annex 1 to this Decree.

(2)The technical requirements for specially designed selected equipment to be applied during the manufacture of such equipment pursuant to Annex 1 to this Decree shall also relate to parts of such equipment.

(3)The technical requirements shall be considered to have been met if the specially designed selected equipment or parts of it satisfy the requirements laid down in the technical specifications for such equipment or parts and the requirements given in the design documentation for nuclear facilities, if such requirements guarantee technical safety under operating conditions, as demonstrated by inspections and technical calculations.

(4)The method for manufacturing specially designed selected equipment or parts and the method for verifying its technical condition in operation for the entire period of its service life shall be included in thetechnical documentation pursuant to the requirements laid down in Annex 3(I) to this Decree.

(5)During the manufacture of specially designed selected equipment or parts, inspections shall be carried out to verify their conformity with thetechnical requirements. The requirements for such inspections are laid down in Annex 4 to this Decree.

(6)After the end of the manufacture of specially designed selected equipment or parts, their condition with regard to technical safety shall be included in the accompanying technical documentation pursuant to the requirements laid down in Annex 3(II) to this Decree. The quality of manufacture shall be demonstrated by assessing the conformity of the specially designed selected equipment or parts with thetechnical requirements and documented by a declaration of conformity meeting the requirements in Annex 3(III) to this Decree issued by the manufacturer. Declarations of conformity shall form part of the accompanying technical documentation.

Assessing the conformity of specially designed selected equipment with thetechnical requirements laid down for such equipment

(with respect to Section 2(oo), Section 4a and Section 4b(1) of the Act)

Section 5

Before commissioning specially designed selected equipment, an assessment shall be made of conformity with the technical requirements for the provision of technical safety (hereinafter “conformity assessment”) pursuant to Section 6 and Annex 2 to this Decree. Conformity assessment of parts of specially designed selected equipment shall be carried out before such parts are used in the manufacture of specially designed selected equipment.

Section 6

(1)Depending on the safety class of the specially designed selected equipment, the different procedures for conformity assessment shall be as follows for:

a)specially designed selected equipment in safety class 1

type testing and quality assurance during the manufacture of specially designed selected equipment (conformity assessment procedures B and D) pursuant to Annex 2(1) and (4) to this Decree,
type testing and verification of specially designed selected equipment (conformity assessment procedures B and F) pursuant to Annex 2(1) and (6) to this Decree,
verification of specially designed equipment as a whole (conformity assessment procedure G) pursuant to Annex 2(7) to this Decree or
complex quality assurance with design testing and special supervision of the final assessment (conformity assessment procedure H1) pursuant to Annex 2(9) to this Decree,

b)specially designed selected equipment in safety class 2

type testing and quality assurance during the manufacture of specially designed selected equipment (conformity assessment procedures B1 and D) pursuant to Annex 2(2) and (4) to this Decree,
design testing and verification of specially designed selected equipment (conformity assessment procedures B1 and F) pursuant to Annex 2(2) and (6) to this Decree,
type testing and quality assurance of specially designed selected equipment (conformity assessment procedures B and E) pursuant to Annex 2(1) and (5) to this Decree,
design testing and type conformity (conformity assessment procedures B and C1) pursuant to Annex 2(1) and (3) to this Decree or
complex quality assurance (conformity assessment procedure H) pursuant to Annex 2(8) to this Decree,

c)specially designed selected equipment in safety class 3

design testing and quality assurance during the manufacture of specially designed selected equipment (conformity assessment procedures B1 a D) pursuant to Annex 2(2) and (4) to this Decree,
design testing and verification of specially designed selected equipment (conformity assessment procedures B1 and F) pursuant to Annex 2(2) and (6) to this Decree,
type testing and quality assurance of specially designed selected equipment (conformity assessment procedures B a E) pursuant to Annex 2(1) and (5) to this Decree,
design testing and type conformity (conformity assessment procedures B and C1) pursuant to Annex 2(1) and (3) to this Decree or
complex quality assurance (conformity assessment procedure H) pursuant to Annex 2(8) to this Decree.

(2)When assessing the conformity of specially designed selected equipment, it shall also be permissible to use a different procedure for a higher category, if any.

(3)In order to assess the conformity of parts of specially designed selected equipment, the conformity assessment procedures laid down in paragraph 1 shall be used as appropriate.

(4)In order to ensure that operations are carried out in accordance with the appropriate conformity assessment procedure, manufacturers shall be obliged to notify an authorised body of the production schedule together with the proposed conformity assessment deadlines.

(5)The conformity assessment procedure used shall be documented. Documents on the conformity assessment procedures used shall include the following:

a)the technical documentation for specially designed selected equipment or parts of it shown in Annex 3 to this Decree and

b)the documents issued during conformity assessment by an authorised person to the extent shown in the different conformity assessment procedures pursuant to Annex 2 to this Decree.

Section 7

Method for providing technical safety for selected equipment in operation and technical requirements for it

(with respect to Section 17(1)(m) of the Act)

(1)Selected equipment shall only be commissioned if a final test pursuant to Annex 4(II) to this Decree has verified that, after the completion of manufacture, the technical safety of the selected equipment is assured in accordance with the technical requirements.

(2)The technical requirements for selected equipment to be applied during operation are laid down by special legislation[2)]. The technical requirements for specially designed selected equipment to be applied during operation are laid down in Annex 1 to this Decree.

(3)The basic requirement for the provision of technical safety during the operation of selected equipment shall be the conduct and evaluation of inspections to verify the conformity of the selected equipment with the technical requirements. Inspection schedules, inspection plans and the procedures for their conduct and evaluation shall be in accordance with the operating regulations for inspections. The requirements for such inspections are laid down in Annex 4 to this Decree.

(4)Documentation supporting the technical safety of selected equipment, including documentation for the preparation and implementation of reconstruction, repairs and maintenance, updated accompanying technical documentation, including records, shall be maintained for the entire duration of operation of the selected equipment pursuant to special legislation1).

(5)For the entire duration of operation of selected equipment, regular assessments of technical safety shall be carried out on the basis of the results of inspections.

Section 8

Transitional provisions

(1)An authorisation holder operating selected equipment during the period when this Decree is in force shall, within 2 years from the entry into force of this Decree, ensure that specially designed selected equipment is differentiated in the list of selected equipment pursuant to Section 3(2) of this Decree and shall submit a list of selected equipment for the approval of the State Office for Nuclear Safety.

(2)The validity of approvals and certificates issued on the basis of existing legislation prior to the entry into force of this Decree shall come to an end 2 years after the entry into force of this Decree.

Section 9

Entry into force

This Decree shall enter into force on the day it is announced.

Chair:

Ms. Drábová (signed)

Annex 1 to Decree No. /Coll.

Technical requirements for specially designed selected equipment

General requirements
The technical requirements given in this annex relate to specially designed selected equipment to the extent laid down in Section 3(1) of this Decree.
The technical requirements for specially designed selected equipment shall be:
technical specifications included in the set of technical regulations, technical standards or technical requirements laying down the required characteristics for specially designed selected equipment, such as quality level, effective properties, safety, dimensions, conditions and requirements for the inspection of equipment and methods for the inspection of equipment, the requirements for marking equipment, conformity assessment procedures, production methods and processes affecting the characteristics of specially designed selected equipment, or
requirements which are to be observed after specially designed selected equipment has been commissioned and the actual conditions for operation, the conditions for operational inspections and the methods to be used for them and the conditions for continued use following repairs to or reconstruction of specially designed selected equipment, if they might affect the technical safety of equipment throughout the entire period of its service life.
Specially designed selected equipment shall be designed in accordance with
therequirements of special legislation[3)],
the basic technical requirements laid down by this Decree,
the requirements laid down in the technical specifications and other operating requirements.
Specially designed selected equipment shall be designed so that
there can be no sudden failure under all test and operating conditions, including impermissible escapes of media,
it is possible to carry out all the necessary planned and unplanned equipment inspections, tests or checks or diagnostics safely during operation,
it is possible safely to carry out cleaning and washing with deactivating solutions and equipment repairs and maintenance.
Specially designed selected equipment shall be manufactured, tested and assembled so as to ensure its technical safety after commissioning.
Specially designed selected equipment shall be capable of performing the required function in normal operation, abnormal operation, under emergency conditions and in design and maximum design accidents and shall be capable of limiting the results of failures and accidents.
When producing designs for specially designed selected equipment or modifications of its technical features, and also as a consequence of changes in the condition of equipment brought about by operating degradation of the materials, an analysis shall be undertaken with respect to the danger with regard to technical safety and the final design shall take account of the results of such analyses.
When selecting the most appropriate solution, manufacturers shall apply the principles shown below in the following order:
exclude or restrict danger to an appropriately achievable extent,
implement appropriate protective measures with respect to dangers which cannot be excluded.
The materials used in the manufacture of specially designed selected equipment and parts providing hermetic sealing for containers shall be covered by materials requirements similar to those for pressure equipment pursuant to paragraphs 4, 5.1 and 5.2 of this Annex.
Design of pressure equipment
General
Pressure equipment shall be designed in accordance with its technical specifications and requirements laying down the loadings and combinations of them for normal operating conditions, abnormal operating conditions, accident conditions and test pressures so as to ensure the technical safety of the pressure equipment throughout the entire period of its proposed service life.
Designs for pressure equipment shall include appropriate safety factors using complex methods which are known to take appropriate account of an adequate level of safety with respect to all kinds of failure to be taken into consideration.
The creation of a design for pressure equipment shall be based on identified
design, operating and test loadings and the limits of them,
operating conditions appropriate for given pressure equipment,
limit parameters for the operating capability of equipment in which mechanical movement is required,
operating modes with a view to its assignment to the appropriate safety class pursuant to a Decree1),
chemical and physical parameters of the media used in the pressure equipment,
corrosive effects of the media on materials in the equipment during the period of the required service life of the structure of the equipment,
requirements to demonstrate resistance to seismic effects or cyclical loading.
Pressure equipment shall be calculated, designed and manufactured so as to exclude or reduce as far as possible the danger of significant loss of resistance to pressure as a result of failures going as far as a loss of integrity of the pressure equipment and the propagation of radioactive substances. In such cases, suitable protective means shall be provided in order to maintain the operating parameters, involving feed systems and heat removal systems to ensure that the level of media in the pressure equipment is maintained and providing for the safe removal of excess heat during operation or following shut-down.
The structures of hermetically sealed containers and equipment and components affecting the sealing of hermetically sealed containers shall be designed and assembled so that it is possible to determine the sealing at design pressure following the installation of all bushes.
The design and execution of piping which is pressure equipment shall ensure that the danger of overloading as a result of impermissible clearances or excessive forces occurring on flanges, connectors, bellows, etc. is regulated, for example by means of supports, braces, anchors, surface adjustment and prestressing brackets.
Design providing appropriate strength
Pressure equipment shall be designed for loadings corresponding to its intended usage and reasonably foreseeable operating conditions. Consideration shall be given to different loadings which might be exerted jointly, bearing in mind the probability of their simultaneous occurrence.
A design providing appropriate strength shall be based on a calculation method pursuant to paragraph 2.2.3 of this annex, if necessary supplemented by an experimental method. Only verified computer programs shall be used in processing calculations.
Calculation method
Resistance to internal pressure and other aspects of loading
The permitted stress for pressure equipment shall be limited with a view to the types of failure, the occurrence of which under operating conditions and in operating modes can be foreseen. It is therefore essential to use such safety factors as make it possible completely to exclude any uncertainty arising out of manufacture, actual operating conditions, stress, computer models and also the properties and behaviour of the material.
The calculation method shall provide a sufficient degree of safety pursuant to the requirements
for the conduct of strength calculations,
for the mechanical properties of the basic and supplementary materials used,
for undetachable (welded) joints and
for the conduct of inspections and tests on pressure equipment laid down by technical regulations or technical standards.
Strength
In order to ensure the strength of pressure equipment, use shall be made of appropriate strength calculations including the appropriate design, operating and test loadings.
When calculating the strength of pressure equipment, account shall be taken in particular of the following loadings:
internal and external pressure,
effect of the weight of the equipment itself and the filling,
additional loadings (effect of the weight of attached equipment, insulation, piping, etc.),
forces from supports and pipes,
thermal effects including thermal shock,
vibration loadings,
seismic effects, wind and flood loadings,
processes causing degradation of materials under the effect of radioactivity,
hydraulic resistances and pressure shocks and
aircraft crashes.
Design loadings
The design pressure shall be equal to or greater than the maximum permissible pressure and shall take account of pressure shocks, faults in the control system and the effects of the system configuration. A test pressure equal to or greater than 1.25 times the design pressure shall be used for designing the basic dimensions of the equipment. For parts of a structure loaded simultaneously with internal and external pressure, the design pressure shall be taken as being the difference between the two pressures at which the greatest wall thickness is achieved.
The design temperature shall be selected with a sufficient degree of safety. The design temperature shall not be lower than the anticipated maximum mean temperature depending on the thickness of the part in question, to which limits apply for normal and abnormal operating conditions. If equipment or pipes are heated by the transmission of heat from sources such as induction spirals, jacketing or an internal heat source, the effect of them shall be taken into account when determining the design temperature.
The design loadings shall be selected so that, in combination with the effects of the design pressure, the greatest equipment wall thickness is determined to which limits apply for normal operating conditions.
The highest values for stress and concentration of tension shall be kept within the safety limits.
Operating loadings

When calculating the strength of pressure equipment, account shall be taken as appropriate of all the loadings occurring under normal operating conditions and also those loadings produced by the technological operation for which the pressure equipment is intended and the external loadings which normally occur. This shall also include loadings giving rise to tension and deformation in the equipment’s material during manufacture, transportation, assembly and pressure testing, including residual tensions, the effect of which on limit strength states shall be assessed individually depending on their importance.