ML20070L631
| ML20070L631 | |
| Person / Time | |
|---|---|
| Site: | Clinch River |
| Issue date: | 12/29/1982 |
| From: | Longenecker J ENERGY, DEPT. OF, CLINCH RIVER BREEDER REACTOR PLANT |
| To: | Check P Office of Nuclear Reactor Regulation |
| References | |
| HQ:S:82:166, NUDOCS 8301030223 | |
| Download: ML20070L631 (5) | |
Text
Department of Energy Washington, D.C. 20545 Docket No. 50-537 HQ:S:82:166 IEC29 M Mr. Paul S. Check, Director CRE' Program Office Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Comission Washington, D.C.
20555
Dear Mr. Check:
PRELIMINARY SAFETY ANALYSIS REPORT (PSAR) UPDATE FOR CHAPTER 3.11 The purpose of this letter is to provide the revision to PSAR Chapter 3.11 to incorporate resolution items discussed between the Nuclear Regulatory Commission and the Clinch River Breeder Reactor project on December 20, 1982. provides revised PSAR Section 3.11.
provides revised response to Question 270.1. These revisions complete resolution of comitments for items 1 and 3 from the November 23, 1982, discussions.
Any questions regarding the information provided or further activities can be addressed to A. Meller (FTS 626-6355) or R. Wishau (FTS 626-6378) of the Project Office Oak Ridge staff.
Sincerely, JohnR.Longeneck+r r
e Acting Director, Office of Breeder Demonstration Projects Office of Nuclear Energy l
2 Enclosures cc: Service List Standard Distribution Licensing Distribution l
0I Q0 r/48 8301030223 821229 PDR ADOCK 05000 s
l 3.11 ENVIRONMENTAL DESIGN OF MECHANICAL AND ELECTRICAL EQUIPMENT 3.11.1 Eculoment identification The safety-related systes which are required to f unction during and following an accident are identi f ied in Section 3.2.
Worst case envirorrnental conditions including temperature, pressure, humidity, sodium aerosol and radiation exposure which result f rom a postulated design basis accident have been def ined f or each location.
The accident environments and the appropriate time of operation applicable to saf ety-related mechanical equipment wil l be incorporated into the Equipment Specifications.
Ref erence 13, PSAR Section 1.6, describes the envirorrnental qualification basis for IE electrical equipment and the progran that will be followed to assure the basis is satisfied.
The objective of this qualification basis and this qualification progran is to conform to IEEE Standard-323-1974 "IEEE Standard for Qualifying Class IE Equipment for Nuclear Power Generating Stations" and NUREG-0588, Rev.
1, " Interim Staf f Position on Enviromental Qual if ication of Saf ety-Related Electrical Equipment." Dif ferences in CRBRP Reactor Technology and Plant Conf Iguration exist and result in deviations f rm the speci fic LWR requirenents del ineated in NUREG-0588 for electrical equipment.
These differences are: the use of liquid metal sodium for the reactor coolant and the resulting sodium combustion product aerosol envirorrnental paraneter; a iow pressure coolant systm with no mechanism for a highly pressurized containment; the absence of steam, containment sprey and the mechanism for water flooding within the containment; environmental separation of the upper containment f rom the lower containment; and placement of redundant heat transport loops in separate cells resulting in independent loop environmental co nd i ti ons.
(Environments in one Ioop do not propagate to the celIs of another ioop.)
NUREG-0588 specifies the worst radiation envirorrnent as an instantaneous release f rcrn the f uel to the atmosphere of 100 percent of the noble gases, 50 percent of the lodines, and I percent of the rer.aining f ission products.
As specified in NUREG-0588, CRBRP uses the normally expected radiation environment over the equipment qualified life plus that associated with 1he most severe design basis accident during or fof Iowing which that equipment must renain f uncti onal. The worst case radiation P3As are the sodium tank f ail ure during mai ntenance, the cover gas rel ease,
.d the application of Site Sultability Source Term (SSST). For the Containment isolation Systen, CRBRP uses the source term definad in NUREG 0588 modified to include I percent plutonium for qualifying Class 1E required to mitigate the consequences of any SSST radiation env i ronment.
In NUREG-0588, minimum qualification time of 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> is specified.
CRBRP requires that equipment be qualifled for the environment in which it must perf orm its saf ety f unction f or the time duration specified f or the saf ety response plus time margin per IEEE 323-1974. CRBRP is in general compliance with the one hour time margin requirenent, however, CRBRP expects that specific exceptions to the one hour time margin will be necessary.
Each exception wil l be justified on a case by case basis.
Fail ure of any equipment af ter its qual if ication (whether longer or shorter than I hour) wil l not result in unsaf e pl ant conditions.
3.11.2 Oual ification Testr and Analvses The CRBRP has a program f or environmental qual if ication of Saf ety-Rel ated Electrical Equipment which is consistent with the objectives and requirenents del ineated in NUREG-0588, Rev.1, " Interim Staf f Position on Environmental Qual if ication of Saf ety-Rel ated El ectrical Equi pment," except as noted above.
This program is described in Ref erence (13) of PSAR Section 1.6, "CRBRP Requirenents for Environmental Qualification of Class 1E Equipment." This document establishes the qualification program which will be conducted to qualify Class IE equipment located in dif ferent areas of the CRBRP and sets f orth the documentation to be canpleted f or qual if ication.
The entire progran is designed to conf orm to the IEEE Standard 323-1974 as endorsed by NUREG-0588.
For saf ety-related mechanical equipment, the capability of the equipment to perf orm its saf ety function wil l be demonstrated by desi gn, analysis, testing, prior operating experience, or a canbination of these. When it is determined that design and/or analysis is not adequate, environmental testing will be perf ormed.
In addition, the saf ety-related mechanical equipment designs will be reviewed to ensure material compatibility with the accident environments and the maintenance and testing required to ensure operability throughout the lif etime of the piant will be def ined.
3.11.3 Oualification Test Results The results of the electrical equipment qualifiction tests will be documented as specified in Ref erence 13 of PSAR Section 1.6 and summarized, as appropr i ate, in the PSAR.
The mechanical equipment qualification results will be contained with the Equipment S'pecification data package.
CRBRP RESPONSE ONE HOUR TIE MARGIN Ouestion OCS 270.1 (3.11)
The NRC staf f position of envirorrnental qual if ication of el ectrical equipment is discussed in NUREG-0588. Discuss your compilance with these requirenents.
If you intend to use WARD-D-0165, "CRBRP Requirenents f or Envirorrnental Qual if ication of Cl ass IE Equipment", identi fy any dif ferences between IEEE 323,1974 and the NUREG-0588 Category 1 requirenents and dicuss how the CRBR desi gn compiI es wIth the NUREG-0588, Category I requi renents.
Resconse The CRBRP progran for envirorrnental qualification of saf ety-re ated electrical equipment, WARD-D-0165, is consistent with the objectives and requirenents del ineated in NUREG-0588, Rev.1, " Interim Staf f Position on Ei.vironmental Qual if ication of Saf ety-Rel ated El ectrical Equipment", except as noted bel ow.
Dif ferences in CRBRP reactor technology and plant conf igurations exist, and, as a result, some specific LWR requirenents delineated in NUREG-0588 are not appl led to CRBRP.
These differences are: the use of IIquid metal sodium for the reactor coolant; a low pressure coolant system with no mechanism for a highly pressurized containment; the absence of stesn, containment spray, and the mechanism for water flooding within the conteinment; environmental separation of the upper containment f rom the lower containment; and placement of redundant heat transport loops in separate cells resulting in independent loop environment conditions (envircrrnents in one loop do not propagate to the celIs of another Ioop).
Paragraph 2.4 of the NUREG-0588, Category 1 requirenents, discuss "Other Qual if Ication Methods".
In this regard, CRBRP requirenents permit type testing, analysis, prior operating experience and/or a combination of these techniques f or equipment qual if ication.
An eval uation of the adequacy of the proposed method woul d be done bef ore using analysis or operating experience in lieu of testing.
Al so, an eval uation woul d be done to determine the necessary extent of any partial type tests required to be provided in support of these methods.
NUREG-0588 specifies the worst radiation environment as an instantaneous release frcrn the fuel to the atmosphere of 100 percent of the noble gases, 50 percent of the lodines, and 1 percent of the renalning fission products. As specif ied in NUREG-0588, CRBRP uses the normally expected radiation envirorsnent over the equipment qualified life plus that associated with the most severe design basis accident during or fof Iowing whlch that equipment must renain f unctional. The worst case radiation DBAs are the in-Containment Primary Sodium Storage Tank f ail ure during maintenance, the cover gas release, f
and the application of Site Sultability Source Term (SSST). The second i
exception concerns the application of time margin to saf ety-related equipment which perf orms its saf ety function 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 qual if Ication time margin of I hour is specified. CRBRP requires that equipment be qual if ied f or the envirorrnent in which it must perf orm its safety function f or the time duration specified for the saf ety response plus time margin per IEEE 323-1974.
e CRBRP is in general compliance with the I hour time margin requirenent.
However, CRBRP expects that specific exceptions to the 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> time margin will P
be necessary.
Each exception will be justified on a case by case basis.
i Faii ure of any equipment af ter its qual ifIcation (whether Ionger or shorter than 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />) will not result in unsaf e plant conditions.