ML20069N106
| ML20069N106 | |
| Person / Time | |
|---|---|
| Site: | Clinch River |
| Issue date: | 12/01/1982 |
| From: | Longenecker J ENERGY, DEPT. OF |
| To: | Check P Office of Nuclear Reactor Regulation |
| References | |
| HQ:S:82:129, NUDOCS 8212020262 | |
| Download: ML20069N106 (5) | |
Text
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Department of Energy Washington, D.C. 20545 Docket No. 50-537 HQ:S:82:129 DEC 01 1997 Mr. Paul S. Check, Director CRBR Program Office Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Comission Washington, D.C.
20555
Dear Mr. Check:
SUMMARY
FOR EQUIPMENT QUALIFICATION DISCUSSIONS, NOVEMBER 23, 1982 The purpose of this letter is to summarize the resolution of items discussed between the Nuclear Regulatory Commission and the Clinch River Breeder Reactor Plant project on November 23, 1982. contains the resolution and comitments regarding the items discussed. is the list of participants.
Any questions regarding the infonnation provided or further activities can be addressed to Mr. R. Wishau (FTS 626-6378) or Mr. A. Meller (FTS 626-6355) of the Project Office Oak Ridge staff.
Sincerely, O/ m'if' J n R. Longen er Acting Director, Office of Breeder Demonstration Projects Office of Nuclear Energy 2 Enclosures gOg l cc: Service List Standard Distribution Licensing Distribution 8212020262 821201 PDR ADOCK 05000537 A
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ENCLOSURE 1 RESOLUTION OF EQUIPMENT QUALIFICATIO.I ITEMS 11/23/82 1.
Application of SSST - The applicant will prepare and present to NRC the basis for requiring equipment qualification to Design Basis Accident environments rather than the SSST environment. The basis will include detailed consideration of the following factors:
Technical adequacy (including margin) of the applicant's proposed program to assure equipment operability during and after accidents; Conservatisms embodied in the proposed approach rela-tive to accidents not currently included in the design basis.
Significant cost considerations between qualifying equipment to a DBA rather than qualifying to the SSST environment (or protecting the equipment from the SSST environment).
We're working toward a presentation for later in December.
2.
One Hour Time Margin - QR 270.1 has been modified as attached (1) to show compliance with NUREG-0588 One Hour Time Margin except for specific cases which will be qualified to appropriate margins and justified on a case by case basis.
PSAR modification will follow.
3.
Mechanical Equipment Qualification - Question Response 270.3 and the PSAR Section 3.11 will be modified to reflect in greater detail the project's mechanical qualification activities. The details discussed are attached (2).
4.
Documentation - Question Response 270.10 will be modified by Dececher 10, to include documentation of mechanical and seismic qualification programs.
5.
The applicant recognizes its responsibility to assure that qualifica-tion requirements are being met by equipn.ent vendors.
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ATTACHMENT (1)
CRBRP RESPONSE ONE HOUR TIME MARGIN Quantton ocs n o.1 a.11)
The NRC staff position of environmental qualification of electrical equipment is discussed in NUREG-0588. Discuss your compliance with these requirements.
If you intend to use WARD-D-0165, "CRBRP Requirements for Environmental Qualification of Class 1E Equipment", identify any differences between IEEE 323,1974 and the NUREG-0588 Category I requirements and discuss how the CRBR
--- design compi les with the NUREG-0588. Category I requirements.
Response
The CRBRP program for environmental qualification of safety-related electrical equipment, WARD-D-0165, is consistent with the objectives and requirements delineated in NUREG-0588, Rev. I " Interim Staf f Position on Environmental Qualification of Safety-Related Electrical Equipment", except as noted below.
Differences in CRBRP reactor technology and plant configurations exist and, as a result, some specific LWR requirements delineated in NUREG-0588 are not applied to CRBRP. These differences are the use of liquid metal sodium for the reactor coolant; a low pressure coolant system with no mechanism for a highly pressurized containment; the absence of steam, containment spray, and the mechanism for water flooding within the containment; environmental separation of the upper containment from the lower containment; and placement j
of redundant heat transport loops in separate cells resulting in independent loop environmental conditions (environments in one loop do not propagate to i
the cells of another loop).
Paragraph 2.4 of the NUREG-0588. Category 1 requirements, discuss "Other QualifIcatlor Methods".
In this regard, CRBRP requirements permit type testing, analysis, prior operating experience and/or a combination of these techniques for equipment qualification. An evaluation of the adequacy of the proposed method would be done before using analysis or operating experience in Ileu of testing. Also an evaluation would be done to determine the necessary extent of any partial type tests required to be provided in support of these methods.
In addition to the design difforences stated above, CRBRP does not apply two NRC staff positions stated in NUREG-0588. The first exception deals with the radiation source term useo for quellfying Class IE equipment located within the containment. NUREG-0588 specifles the worst radiation environment as an instantaneous release from the fuel to the atmosphere of 100 percent of the l
noble gases, 50 percent of the lodines, and 1 percent of the remaining fission I
products. CRBRP uses the normally expected radiation environment over the equipment quellfled life plus that associated with the most severe design basis accident during or following which the equipment must remain functional.
The worst case radiation DBA is the in-Containment Primary Sodium Storage Tank f ailure during maintenance. [ The second exception concerns the application of time margin to safety-relate'd equipment which performs its safety function
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within a short time period into the event (i.e., less than 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />).
In NUREG-0588 a minimum qualification time margin of I hour is specifled.
CIlBRP requires that equipment be qualifled for the environment in which it must perform its safety function for the time duration sp xifled for the safety response plus time margin per IEEE 323-1 Failure of any equipment after its qualification time (whether i or shorter than I hour) will not result in unsaf= afan+ W MI w. 7 CRBRP is in general compliance with the 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> time margin requirement, how Amend. 68 1
ever, CRBRP expects that specific exceptions to the one hour time margin will be necessary. Each exception will be justified on a case by case basis.
May 1982
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Attcchment (2)
DETAILS DISCUSSED FOR ITEM 3 Identify all safety-related mechanical equipment.
e Define the enveloping environments applicable to each piece of e
safety-related mechanical equipment, including the duration.
Incorporate these environments and functional requirements into e
the equipment specifications.
Develop criteria based on the ASHI code, the active pump and valve e
requirements, and the seismic design requirements.
Review designs for material compatibility with the accident e
environments.
Define the maintenance and testing required during operation to e
ensure that the equipment will be able to perform its safety func-tion throughout the lifetime of the plant.
Documentation will be provided as described in the response to e
Question 270.10.
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ENCLOSURE 2 PARTICIPANTS EQUIPMENT QUALIFICATION November 23, 1982 Name Organization
- - Al Meller CRBRP-P0/PMC S. M. Kowkabany Burns & Roe E. R. Wittry CRBRP-PO M. S. McKeown W-OR R. G. LaGrange NRC/NRR/DE/EQB Rich Stark NRC Hukam Garg NRC/DE/EQB D. Elias CRBRP-PO Neil Brown GE (WLLCO)
Will Carraway Westinghouse - CRBRP (0.R.)
Roger Wishau CRBRP-PO Dallas Hicks CRBRP-PO George Clare Westinghouse, Oak Ridge Larry W. Bell NRC/NRR/DSI/AEB Robert Wright NRC/NRR/ DOE /EQB l
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