L-98-072, Submits Updated Response to Safety evaluation-Joint Owner'S Group Program on Periodic Verification of motor-operated Valves,Per GL 96-05

From kanterella
(Redirected from L-98-072)
Jump to navigation Jump to search
Submits Updated Response to Safety evaluation-Joint Owner'S Group Program on Periodic Verification of motor-operated Valves,Per GL 96-05
ML20217A134
Person / Time
Site: Beaver Valley
Issue date: 04/13/1998
From: Jain S
DUQUESNE LIGHT CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-96-05, GL-96-5, L-98-072, L-98-72, NUDOCS 9804220170
Download: ML20217A134 (3)


Text

.,

1 I

g Beave Va ey Power Station l Shippingport. PA 15077-0004 l

SUSHIL C. JAIN (412) 393 5512 Senior Vice President April 13, 1998 Fax (724) 643-8069 Nuclear Poww Divisim L-98-072 U. S. Nuclear Regulatory Commission

/ Attention: Document Control Desk Washington, DC 20555-0001

Subject:

Beaver Valley Power Station, Unit No. I and No. 2 BV-1 Docket No. 50-334, License No. DPR-66 BV-2 Docket No. 50-412, License No. NPF-73 I Updated Response to Safety Evaluation-Joint Owner's Group Program on l Periodic Verification of Motor-Operated Valves (in response to Generic l Letter 96-05) 1

References:

1. Safety Evaluation on Joint Owner's Group Program on Periodic Verification of Motor-Operated Valves Described in Topical Report MPR-1807 (Revision 2).
2. Generic Letter 96-05, Periodic Verification of Design-Basis Capability of Safety-Related Motor-Operated Valves," dated 9/18/96.
3. DLC submittal to NRC, "180-Day Response to Generic Letter 96-05,"

dated March 17,1997.

l On October 30, 1997, the Nuclear Regulatory Commission issued Reference I which, within the conditions and limitations described in the Safety Evaluation, stated that the Staff considers the Joint Owner's Group (JOG) program on MOV Periodic Verification an acceptable industry-wide response to Generic Letter (GL) 96-05.

The JOG had agreed that after the issuance of the Safety Evaluation (SE), requests would be made for participating utilities to notify the NRC of their plans to implement the JOG program described in Revision 2 of the topical report which was the subject of the SE (i.e., MPR-1807, Rev. 2) and that any dmiations from the JOG program would be justified.

By this letter, Duquesne Light Company (DLC) is providing the requested SE response.

D I

  1. DEllVEllNG 9004220170 980413 lh, . O' I ) QUALITY PDR ADOCK 05000334 P PDR ENERGV

1 Beaver Valley Power Station, Unit No. I and No. 2 Updated Response to Safety Evaluation-Joint Owner's Group Program on Periodic Verification of Motor-Operated Valves Page 2 I

DLC plans to continue participating in the JOG MOV-Periodic Verification (PV)

Program as a member of the Westinghouse Owners Group and to implement the program '

elements described in Topical Report MPR-1807, Revision 2. In addition, DLC will continue the implementation of the balance of its Periodic Verification Program as summarized in our original submittal letter (Reference 3).

With respect to risk-ranking of MOVs as it penains to the JOG PV static test matrix, DLC utilizes the three level categorization method based on the guidance provided in Westinghouse Owners Group Engineering Repon V-EC-1658, Revision 1,

" Risk Ranking approach for Motor Operated Valves in Response to Generic Letter 96-05," with the following noteworthy exceptions:

. MOVs were only ranked based on Core Damage Frequency (CDF) importance measures since the Level 2 top event failures at Beaver Valley that lead to large early releases are based on containment phenomena (e.g., consequences of high pressure melt ejections) resulting from Level I system failures. Therefore, Large Early Release Frequency (LERF) imponance measures were judged not to be relevant.

. Only MOVs not modeled in the PRA were reviewed using the expert panel approach presented in the report.

. A quantitative approach using the PRA CDF importance measures was used to preliminarily rank the MOVs. The PRA analyst then used his judgment to review these results and assign a qualitative final ranking.

. MOVs that were only modeled as passive failures (e.g., MOV transfers closed) in the PRA were ranked based on the PRA CDF importance measures for that passive failure, then qualitatively reassessed by the PRA analyst to determine a final ranking.

If you have any questions on this submittal, please contact Mr. J. Arias, Director, Nuclear Safety & Licensing Depanment, at (412) 393-5203.

Sincerely, 1

Sushil C. Jain l

l 1

t Belver Valley Power St: tion, Unit No. I and No. 2 Updated Response to Safety Evaluation-Joint Owner's Group Program

! on Periodic Verification of Motor-Operated Valves Page 3 '

c: Mr. D. S. Brinkman, Sr. Project Manager Mr. D. M. Kern, Sr. Resident Inspector Mr. H. J. Miller, NRC Region I Administrator Thomas H. Essig, NRC Thomas G. Scarbrough, NRC l

l l

j i i l

l l

,