ML20096F172
| ML20096F172 | |
| Person / Time | |
|---|---|
| Site: | 05200001 |
| Issue date: | 04/29/1992 |
| From: | Fox J GENERAL ELECTRIC CO. |
| To: | Burton B NRC |
| Shared Package | |
| ML19303E829 | List: |
| References | |
| NUDOCS 9205200241 | |
| Download: ML20096F172 (5) | |
Text
APR 29 '92 03tS7PM G C NLCLEAR BLDG J P #./36 7
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MR E9 '92 03:57Pt1 G E tUC_EM ELDG J P.I G rdM nutocAE Standard PJgLnt myD 3.11 ENVIRONMENTAL QUALIFICATION 3,11.1 Equipment Identification and OF SAFETY-RELATED MECHANICAL Environmental Conditions AND ELECTRICAL EQUIPMENT Safetv related electrical equipment within This section defines the environmental the scope of this section includes all three conditions with respect to limiting design categories of 10CFR50.49(b) (Reference 1).
conditions for all the safety related mechanteal Safety related mechanical equipment (e.g.,
and electrical equipment, and documents the pumps, motor operated vabes, safety relief oualification methods and procedures employed to valves, and chec~r valves) are as defined and f
demonstraie the capability of this equipment to identified in Section 3.2.
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perform safety related functions when expssed to
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- the environmeml conditions in their respective A A list of all safety related electrical and location. The safety related equipment within mechanical equipment that is 'ocated in a harsh the scope of this section are defined in environment area will be includeo in the Subsection 3.11.1. Dyaamic qualification is Environmental Qualification Document (EOD) to be addressed in Sections 3.9 and 3.10 for Seismic prepared as taentioned in Subsection 3.11.6.
Category I mechanical and electrical equipment, respectively.
Environmental conditions for the zones where safety-related equipment is located a:e 1.imiting design coaditions include the calculated for normal, abnormal, test, accident following:
and post accident conditions and are documented in Appendir 31, Equipment Qualification (1) Normal Operating Conditions
- planned, Environmental Design Criteria (EOEDC). pg purposeful, unrestricted reactor operating Environmental conditions are tabulated by zone <
modes including startup, power rance, t,t ach zone defining a specific area in t_he standby (condenser available), shutdow, and lant.
ypical equipment in the noted zonesTs refueling modes; s own in the)ligures in Section 6.2,12.3 an,g['
(4ppendix 9A.C
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(2) Abnormal Operating Conditions - any deviation from normal conditions anticipated Environmental parameters include temperature, l to occur often enough that the design should pressure, relative bumidity, and neutron dose l include a capability to withstand the rate and integrated dose. Radiation dose for I coditions without operational impairment; gamma and beta data for both normal and accident :
conditions will be provided by applicant 6 r.
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(3) Test Conditions - planned testing including encing the ABWR design in accordance with the '
pre operational tests; interface requirements in Subsection 1213.1.
Tbc radiation requirements are site specific ;
(4) Accident Conditions a single event not documentation owing to the need to model -
reasonably expected dring the course of specific equipment which is applicant deter.
plant operation thu has been hypothesized mined, tbc HVAC detailed modeling, and the for analysis purposes or postulated from evolving considerations in the area of accident unlikely but possible situations or that has source terms are expected to generate signi- ;
the potential to cause a release of ficantly differing radiation requirements. l radioactive material (a reactor coolant Where applicabic, these parameters are given in pressure boundary rupture may qualify as an terms of time-based profiles.
l accident; a fuel cladding defect does not);
and The magnitude and 60 year frequency of occurrence of significant dem* ions from normal (5) Post Accident Conditions during the length plant environmcuts in Ih zonet bave of time the equipment must perform its insignificant effects on equipment total thermal safety-related function and must remain in a normal aging or accident agit g.
Abnormal safe mode after the safety related function conditions are overshadowed by the normal or is performed.
accident conditions in the Appentix 31 tables.
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APR 29 '92 03:58PM G E tOCLEAR BLDG J P.A 36 ABWR aut:cae Standard Plant nrv a Margin is delined as the difference between the most severe specified service conditions of the plant and the conditions used for qualification.
Margins shall be inciuded in the qualification parameters te account for notanal variations in commercial production of equipment and reasonable errors in defining satisfactory performance. The j environmental (,parametek in the Appendix 31
- 4. '
E tables do not include margins.
/
Some mechanical and electrical equipment may 7,be required to perform an intended safety i function between minutes of the occurrence of the
/ event but lea than 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> into the event.
/ Such equipment shall be shown to remain i functional in the accident environment for period h of at least 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> in excess of the time assumed in the accident analysis unless a time margin of l
flless than one hour can et justified. Such Justification will include for each piece of
/(/equipment: (1) consideration of a spectrum of
)
' breaks; (2) the potential need for the equiptnent
( later in the event or during recovery operations; t (3) a determination that failure of the equipment ff after performance of its safety function will not be detrimental to plant safety or mislead the
)j operator; and (5) determination that tp margin applied to the minimum operabilitptune, when combined wi:b vtber test margins, will account b' for the uncertainties associated with the use of f analytical techniques in the derivation of
' environmental parameters, the number of units b tested, production tolerances, ar d test equipment 17irisecurancies.
The environmental conditions shown in the Appendix 31 tables are upper bound envelopes used to establish the environmental design and qualification bases of safety-related equipment.
[The upper bound envelopes indicate that the zone I dsta reflects the worse case expected environment hproduced by a compendium of accident condition
/ Estimated chemical environmental conditions are also reported is Appendix 31.
3.11.2 Qualification Tests and Analyses Safety related electrical equipment that is located ira harsh' environment is qualified by test or other methods as described in IEEE 323 31141 Amendment r
- S xt 35-92: 159,
APR 29 '92 03:h9PMGENUCLEARBLDGJ P.5/36 s
MM m 6KcAE Sandard Plant av n and permitted by 10CFR50.49(f) (Reference 1).
3.11.3 Qu:.lification Test Results Equipraent type test is the preferred method of qualification.
The results of qualification tests for safety related equipment will be documented.
Safety related mechanical equipment that is rnaintained, and reported as mentioned in located in a har3 environment is qualified by Subsection 3.11.6.
analysis of materisis data which are generally based on test and operating experience.
3.llA LOSS of Heating, Ventilating, and Air Conditioning Th qualification methodology is described in detail in the NRC approved licensing Topical To ensure that loss of heating, ventilating, Report on GE's environmental qualification and air conditioning (HVAC) system does not program (Reference 2). This report also adversely affect the operability of safety-addresses compliance, with the applicable portions related controls and electrical equipment in of the General Design Criteria of 10CFR50, buildings and areas served by safety related App:ndix A, and the Quality Assurance criteria of HVAC systems, the HVAC systems serving these 10CFR50, Appendix B. Additionally, the report areas meet the single f ailure criterion.
describes conformance to NUREG-0538 (Reference. Section 9.4 describes the safety related HVAC 3), aun Regulatory Guides and IEEE Standards systems including the detailed safety referenced in Section 3.11 of NUREG 0800 evaluations. The loss of ventilation (Standard Review Plan),
calculations are based on maximum heat loads and
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consider operation of all operable equipment 4
Mild environment equipment is that equipment regardless of safety classification.
which, during or after a design basis event (DBE, as defined in Reference 2), does not experience 3.11.5 Estimated Chemical and Radiation an environment that is significantly more severe Environment than that existing during normakand abnormal [3.11.5.1 Chemical Environment df i
events. Additionally, equipment that experiences the environment of a DBE can be treated as if it were in a mild environment if the equipment falls Equipment located in the containment drywell into either of the following categories:
and wetwell is potentially subject to water spray modes of the RHR system. In additian.
(1) The equipment accomplishes its safety func-equipmeat in the lower portions of the tion prior to experiencing the environment containment is potentially subject to k of the DBE and the equipment will not fail submergence. The chemical composition and in a manner detrimental to plant safety, or resulting pH to which safety related equipment is exposed during normal operation and design (2) The equipment is not needed to mitigate the basis accident conditions is reported in DBE and the equipment will not fail in a Appendir 31.
manner detrimental to plant safety.
Sampling stations are provided for periodie The vendors of mild environment equipment are analysis of reactor water, refueling and fuel required to submit a certificate of compliance storage pool water, and suppression pool water certifying that the equipment has been qualified to assure cornpliance with operational limits of for the requirements specified to assure its the plant technical specifications.
required safety-related function in its ap-plicable environment. This equipment is qual.
3.11.5.2 Radiation Environment ified for dynamic loads as addressed in Sections 3.9 and 3.10. Further, a surveillance and Safety.related systems and components are maintenance program will be developed to ensure designed to perform their safety related equipment operability during its designed life.
function when exposed to the normal operational radiation levels and accident radiation levels, ween /
3 11-2
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