ML20235M383
| ML20235M383 | |
| Person / Time | |
|---|---|
| Issue date: | 11/07/1988 |
| From: | Conran J Committee To Review Generic Requirements |
| To: | Committee To Review Generic Requirements |
| Shared Package | |
| ML20235A909 | List: |
| References | |
| NUDOCS 8902280234 | |
| Download: ML20235M383 (3) | |
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4 EI'D T()pg g November 7, 1988 MEMORANDUM FOR: CRGR Members FROM: Jim Conran, CRGR Staff l
SUBJECT:
ISSUES IDENTIFICATION FOR CRGR AGENDA ITEM l MEETING NO. 150 - November 9, 1988 !
l Enclosed for your information is an Issue Sheet. and additional backgound j documents, relating to an agenda item on which the Committee will receive a I briefing at Meeting No. 150. the proposed NRC staff SER on BAW-10167 (Just i f i c at i on for Increasing the RTS On-Line Test Intervals). If there are j any questions, call me at 492-9855. '
rd Jim Conran J CRGR Staff )
l
Enclosures:
As stated 1
8902280234 881104 ,
PDR REVGP NRCCRGR MEETING 150 PDC
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I 5900eCY_dOd_lssyg_1dgetificatigo l for C8Ge_egende_Itge_:_Megtigg_Ngz_150 November 9 1988 IDENTIFICATION Proposed SER on B&W Topical Report BAW-lOl67 and Supplement 1. " Justification for Increasing the Reactor Trip System On-Line Test Intervals"; this SER would allow licensees to increase RTS surveillance intervals and RTS channel allowable outage times (AOTs) for B&W plant designs.
OBJECTIVE The staff'has proposed that the subject SER be issued without the need for formal CRGR review, and offered a ht[gflog to the Committee to provide-informtion and dicussion in support of the NRR view that a formal review is not required. The requests a determination by the Committee that-this approach is acceptable under the Charter.
BACKGROUND
- 1. The package sent to the Committee for consideration in this matter was transmitted by memorandum dated September 30, 1988. J.H. Sniezek to E.L.
Jordans that package included'the following documents:
- a. Enclosure 1 - Draft Letter (undated) to C.W. Smythe. Chairman BWOG/T.S. Committee
- b. Enclosure 2 - Proposed Safety Evaluation Report (undated). B&WOG Topical Report BAW-10167, " Justification for.
Increasing the RTS On-Line Test Intervals" The above documents were distributed to CRGR members with the agenda for 1 this meeting, along with excerpts from the Minutes of Meeting No.. 118 i (CRGR review of a similar proposal for increasing BWR RPS surveillance intervals and RPS channel AOTs).
- 2. Enclosed with this Issue Sheet for the information of the Committee are additional background documents requested by the CRGR staff. These documents are referenced in the documents identified in (1.) above, and may be useful to Committee members in discussing details of the staff's SER at the planned briefing, and in determining whether a formal review-of this item is required:
- a. Topical Report BAW-lOl67 dated May 1986,
- b. Supplement 1 to BAW 10167 (Questions and Answers) dated February 1988.
- c. NRC Consultant's Technical Evaluation Report-dated September 1988, I
EGG-REO-7718. " Review of B&W Owner's Group-Analyses for Increas-ing the Reactor Trip System On-Line Test Intervals".
DISCUSSION / ISSUES The staff proposes to issue the proposed SER without the need for formal CRGR review because (a) the subject topical' report and its supplement do not present any new methodology or require a staff position significantly-different from that previously established for BWR and Westinghouse PWR plants, and (b) the increased RTS surveillance intervals and RTS channel AOTs do not result in an. unacceptable increase in net risk to the public.
Briefly, the SER would permit (but not require) licensees to increase RTS q surveillance intervals from one month'to six months, and to increase RTS channel AOTs from one hour to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, for B&W design plants.
l CRGR staff preliminary review has identified the following possible l questions / issues for discussion with the staff:
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- 1. As alluded to by the staff in the transmittal letter for this package, the Commi ttee has previousl y revi ewed a similar proposal for relaxations of BWR RPS surveillance intervals and ADTs (see excerpts from the Minutes for CRGR Meeting No. 118, provided with the SER package).
However, the relaxations which the staff proposes to approve here for B&W PWRs are significantly greater. Specifically, surveillance intervals were extended from monthly to quarterly,'and AOTs from one hour to a maximum of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, {gr_BWRs; by comparison, the staff proposes to extend surveillance intervals'from one month to six months, and AOTs from one hour to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, for B&W PWRs. The Committee may i wish to discuss with the staff these comparative treatments of BWRs vs ]
B&W PWRs. as well as the treatment of Westinghouse and CE PWRs in this '
regard.
- 2. The B&WOG submittal appears to indicate that their analyses support an almost indefinite RTS channel AOT (i.e., 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br />), or in effect operation with a three channel, rather than a four channel, system. In this context, the Committee may wish to discuss the basis for the staff l
determination that the relaxed ADT for the existing four channel' system should be 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.
- 3. In their earlier review of BWR RPS surveillance interval and AOT relax-ations, the Committee noted, in a collateral recommendation to the EDO, I
the importance of effective means to track train-level reliabilities for RPS and other nuclear plant systems . The Committee may wish to pursue a followup discussion with the staff, and consider an appropriate followup recommendation to the EDO, in connection with this current (Tech Spec ) rel ax ati on proposal .
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