ML20195F865

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Forwards Request for Addl Info Re MSIV Operability at Facility,Based on Initial Review of Util Rept Entitled, Final Rept 10CFR50.55(e) MSIV Actuators, Forwarded by Util
ML20195F865
Person / Time
Site: Nine Mile Point, 05000000
Issue date: 10/31/1986
From: Luckas W
BROOKHAVEN NATIONAL LABORATORY
To: Berkson H
Office of Nuclear Reactor Regulation
Shared Package
ML20150F672 List:
References
CON-FIN-A-3349, FOIA-88-356 NUDOCS 8611040400
Download: ML20195F865 (3)
v • d • e


Text

1 b BROOKHAVEN NATIONAL LABORATORY (l(ll ASSOCIATED UNIVERSITIES, INC.

Upfon. Long Island. Now York 11973 (516)282s l F IS 666 ' 7562 ,

l l

\

j October 31, 1986

. l l

Dr. Ilarold Berkson

, Mail Stop P-522 Technical Assistance N nagement Sranch Planning and Program Analysis Staff Office of Nuclear Reactor Regulation i U.S. Nuclear Regulatory Coaunission )

Washington, D.C. 20555 i l

Dear Harold:

Please find enclosed a Request for Additional Inf ormation (RAI) f or Nine L Mile Point Unit No.2 (NMP2) Docket No. 50-410 regarding Main Stes:n Isolation {

Value (MSN) Operability dated October 30, 1986. This RAI was developed i largely based on an initial review of the report forwarded by Niagars Mohawk Power Corporation's October 21, 1986 letter NMP2L 0920 to NRC Region 1. The report entitled "Finel Report LOCFR50 55(e) MSIV Actuators" f or NMP2 was l received at Brookhaven National Laboratory (BNL) on October 28, 1986.

A copy of the enclosed RAI has been telecopied to the Lead Engineer, Mr. j James J. Lombardo of the NRR Division of BWR Licensing, E..gineering Branch. l l

This effort to develop the enclosed RAI will be charged to Task Assignment 87-01 under FIN A-3349. Project 2 as authorized in your October 3, 1986 letter to BNL (A. Romano).

If you have any questions, do not hesitate to call.

Best regards, e

. . Luc as, r . , G rou p ',ca d e r i

Engineering Analysis & Human Factors Group VJL :ag Encisscci R. Bari (w/o enc 1)

A. Coppois R. Hall W. Xato (w/o enc 1)

J. Lombardo (NRC) i d (0611040}40;61031 $,'

g - ADOCK 0500g 10 3 [fy, $ f,j

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MAIN STEAM ISOLATION VALVE (HSIV) OPERABILITY NINE MILE POINT UNIT 2 (NMP2)

REQUEST FOR ADDITIONAL INFORMATION Page 1 of 2

. October 30, 1986 The f ollowing questiens, observations and requests to provide additional inf ormation or clarifications are based largely on an initial review of Niagara Mohawk Power Corp's October 21, 1986 letter NKP2L 0920 to NRC Region 1, f orwarding "Final Report 10CFR$0.55 (e) MSIV Actuators" for NMP2. The items below reference the report by page numbers f ollowed by section numbers as indicated in parenthesis at the beginning of each item.

Please note that the main concern is the docunentation of the actual testing of the new "hydraulic latch" design to demonstrate that the NMP2 KSIVs meet the 3 to 5 second Technical Specification clonvre requirement as emphasized in Item 10. Furthe rmore , if the closure requirement can not be demonstrated, can the closure requirenant problem be isolated to the valve's ability to be closed or to the actuator's ability to perf orm the closure function?

1. (4,1.1) Ju=tification for the corrective action to resolve the actu-ator problems is based in part on the use of "the testing renutts to date".

Please explain or reference by existing documentation these "testing results to date".

2. (5,1.2) "The problem resolution presented in this report includes sufficient testing and analyses to demonstrate that the KSIVs will close reli-ably". Please explain or reference by existing documentation the role of testing in this demonstration.
3. (5,1.2) "The design modifications which have been made to the actuating mechanism have been thoroughly evaluated and tested to ensure the operability and reliability of the HSIVs. "Plea 9e explain or reference by existing documentation the role of testing in providing this assurance, including the "rigorous operability testing program at the manuf acturer's facility."

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4. (24,4.2.1) Considerable testing and analysis had already been done with the original mechanical latch actuator. The revised design of the setuator f rom mechaniest to a hydraulic latch "coutains very little substantive change". Therefore, the safety evaluation of the revised actuator takes advantage of the testing and analysis already performed. Please provide testing related results which support this position.

'i murms-gymmma M4 wumer . - . . . . . . .

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  1. c *- ~ MAIN STEAM ISOLATION VALVE (MSIV) OPERABILITY NINE MILE POINT UNIT 2 (NMP2)

REQUEST FOR ADDITIONAL INFORMATION Page 2 of 2 October 30, 1986

5. (2 5 ,4 . 2 .1.1) Seismic "qualification of the solenoid operated valves (SOVs) will include the results of existing analysis and tests, and new opera-bility testing ... will be completed prior to fuel load". Please provide the test results data. If not yet available, please provide date when expected .
6. (26,4.2.1 2) "Functional operability testing of each new (hy-draulic) cylinder at the vendor's facilities has been performed and docu-mented". Please provide the documentation.
7. (2 7,4. 2. 2. ) "Initial testing of the hydraulic istch design on the prototype revealed that the original SOVs ... were not capable of opening quickly enough to support the 3 to 5 second MSIV closure requirement". The cause is attributed to sticking 0-ring seals in the SOVs with resultant rede-signed SOV seat disc and ring materials being tested. "Based on the success-ful test results on the prototype actuator ... the valve was tsodified..."

Please provide the test results.

8. (28,4.2.3) "Ongoing testing will provide additional verification of system design parameters, including pump cycle times and actuator trip times". Please provide the test results. If not yet available, please provide dates when expected.
9. (32,5.0) As part of Additions 1 Confirma*.ory Testing, "A prototype test program is being developed. This test configuration will duplicate the valve and actuator configuration installed at HMP2". According to Section 6.2.4 of the NMP2 finsi report on MSIV leakage entitled "Initial Protocype Test Program", ",,, full closure tests ar. high steam flow rate at operating l pressure and temperature..." will be conducted. W111 these prototype tests, which are scheduled to be coep'isted by April 1,1987, espresent the first time 3 that closure t!ee of the new hydraulis Latch" design (with the M81Vs reduced leakage modification) is tested against their Technical Specifications l closure time requirements?
10. (32,6.0) "When the modifications discussed in this report have been completed and r.he valvea have succesrfully passed their preoperational tests, the MSIVs will be appropriate f or normal operation of the pier.t". According to the September 24, 1986 presentation handout, entitled "NRC NMP2 MSIV MEETING" testing was scheduled for performance October 21, through November 3,1986.

Also according to the handout, the "MSIV ACTUATOR / TESTING RESULTS" provided "RESPONSE TIMES . VITHIN 5 SEC. VALVE CLOSl'Pf. AEQUIREMENT". Also see Item 7 above. Please provide the test rsquirtwnts and results of the MSIV related pre-op tests, when available.

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