ML20202E335

Forwards Request for Addl Info Re 960926 Event Identifying 21 safety-related Air Operated Valves,Controlled by Solenoid Operated Pilot Valves,Which Do Not Receive Class 1E Power & Event Notification W/Ler 96-036-00,dtd 961025

ML20202E335
Person / Time
Site:	Millstone
Issue date:	01/09/1998
From:	Andersen J NRC (Affiliation Not Assigned)
To:	Bowling M, Loftus P NORTHEAST NUCLEAR ENERGY CO.
References
TAC-M98860, NUDOCS 9802180125
Download: ML20202E335 (5)

Text

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m T, - January- 9,--1998 c-  : ur. u.rtin ti Ba*a9 Recovery Officer- Millstone RECElVE0- 4

- Unit No. 2 ^

- Northeast Nuclear En6rgy Company. 1998 m g2 fii I: 52 clo Ms. Patricia A. Loftus Director- Rwgulatory Affairs PUBLic DOCUMENT ROOM P.O. Box 128 Waterford, CT 06385 !

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION REGARDING A SEPTEMBER 26,-

' 1996, EVENT NOTIFICATION AND LICENSEE EVENT REPORT _(LER)

I.-

96-036-00 (TAC NO. M98860) -

. Deer Mr. Bowling:

On September 26,1996, Northeast Nuclear Energy Company (NNECO) informed the NRC,-

pursuant to Title 10 of the Code of Federal Ra9ulations. Section 50.72(b)(iii)(D), that it had

. identified 21 safety-related air operated valves that are controlled by solenoid operated pilot -

valves, which do not receive Class 1E power. NNECO followed up the event notification with q LER 96-036-00, dated October 25,1996. . By letter dated February 12,1997, the NRC requested '

i additional information regarding the subject LER, which NNECO iesponded to on April 18,1997. '

The NRC staff has completed a preliminary review of the event and has conducted additional onsite review of NNECO's corrective actions. Based on these reviews, the staff has identified -

severalissues that require additionalinformation. Please respond to the enclosed request for '

additionalinformation expeditiously in order for the staff to complete its review in a timely' manner Sincerely, GrIsinaisisaoab Ja[mes W. Andersen, 4 hroject Manager 4 Special Projects Office - Licensing Office of Nuclear Reactor Regulation Docket No. 50-423 DISTRIBUTION Docket File . PMcKee ACRS

Enclosure:

As stated ' PUBLIC 7 JAndersen SPO-L R/F- LBerry cc wienet See next page SPO R/F .OGC JDurr, RI: - WTravers

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DOCUMENT NAME:g:tanderson/98860.RAI Ty receive a copy of this document, Indicate in the box "C" copy wie attachtenct "E" copy wlattachtenct "N" P. Mopy OFFICE ~ Pe:SPO-L / ' LA:SPO-L fl 0 -L a RAME= JAnderser  :. Berry ] PM ee DATE' l l1 b - 198 , 01/07/9C q PS I/N 198 OFFICIAL RECORD CONY -

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North 2:st Nucl;;r Energy Comp:ny Millstona Nuclear Power Station v

Unit 3 cc:

Mr. \Nilliam D. Meinert Lillian M. Cuoe . Esquire Nuclear Engineer Senior Nuclear Counsel Massachusetts Municipal Wholesale Northeast Utilities Service Company Electric Company P. O. Box 270 P. O. Bex 426 Hartford, CT 061410270 Ludiow,iAA 01056 Mr. Kevin T. A. McCarthy, Director Joseph R. Egan, Esquire Monitoring and Radiation Division Egan & Associates, P.C.

Department of Environmental Protectk, 2300 N Street, NW 79 Elm Street Washington, D.C. 20037 Hartford, CT C3106-5127 Mr. F. C. Rothen

! Regional Administrator, Region i Vice President Work Services U.S. Nuclear Reguletory Commission Northeast Utilities Service Company 475 Allendale Road P. O. Box 128 King of Prussia, PA 19406 Waterford, CT 06385 First Selectmen Err' < t C. Hadley, Esquire Town of Waterford 1NJ Mairi street Hall of Records P. O. Box 549 200 Boston Post Road West Wareham, MA 02576 Waterford, CT 06385 Mr. John Buckingham l Mr. Wayne D. Lenning Department of Public Utility Control Deputy Director of Inspections Electric Unit Special Projects Office 10 Liberty Square 475 Allendale Road New Britain, CT 06051 King of Prussia, PA 19406-1415 Mr. James S. Robinson Michael H. Brothers Manager, Nuclear investments and Vice President - Operations Administration Northeast Nuclear Energy Company New England Power Company -

P. O. Box 128 -

Waterford, CT 06385 25 Research Drive Westborough, MA 01582 Mr. M. R. Scully, Executive Director Mr. D. M. Goebel Connecticut Municipal Electric Vice President - Nuclear Oversight Energy Cooperative Northeast Utilities Service Ccmpany

. 30 Stott Avenue P.O. Box 128 Norwich, CT 06360 Waterfoid, CT 06385 Mr. David Amerine Deborah Katz, President Vice President - Nuclear Engineering and Support Citizens Awareness Network P.O. Box 83 Northead Utilities Service Company Shelburne Falls, MA 03170 P. O. Box 128 Waterford, CT 06385

Northust Nucirr Energy Company Millstona Nuclear Power Station s-Unit 3 cc:

Senior Resident inspector Mr. Daniel L. Cerry Millstone Nuclear Power Stat:on Project Director c/o U.S. Nuclear Regulatory Parsons Power Group Inc.

Commiscion 2675 Morgantown Road P. O. Box 513 Reading, PA 19607 Niantic, CT 06357 Mr. Don Schopfer Mr. A!!an Johanson, Assistant Director Verification Team Manager Office of Policy and Management Sargent & Lundy Policy Development and Planning Division 55 E. Monroe Street 450 Capitol Avenue - MS# 52ERN Chicago, IL 60603 P. O. Box 341441 Hartfo:d, CT 00134-1441 Mr. J. P. McElwain Vice President (Acting)- Millstone 3 Citizens Regulatory Commission Northeast Nuclear Energy Company ATTN: Ms. Susan Perry Luxton P.O. Box 128 180 Great Neck Road Waterford, CT 06385 Waterforo, CT 06385 ,

Mr. G. D. Hicks The Honorable Terry Concannon Unit Director - Milletone Unit 3 Co-Chair Northeast Nuclear Energy Company l Nuclear Energy Advisory Council P.O. Box 128 R:om 4035 Waterford, CT 06385 Legislative Office Suilding Capitol Avenue Hartford, CT 06106 Mr. Evan W. Woollacott Co-Chair Nuclear Energy Advisory Council 128 Terry's Plain Road Simsbury, CT 06070 Little Harbor Consultants, Inc.

Millstone -ITPOP Project Office P. O. Box 0630 Niantic, CT 06357-0630 Mr. B. D. Kenyon Chief Nuclear Officer - Millstone Northeast Nuclear Energy Company P. O. Box 128 .

Waterford, CT 06385

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REQUEST FOR ADDITIONAL INFORMAT;ON MILLSTONE NUC'. EAR POWER STATION. Ul1Tl IITLE 10 OF THE CODE OF FEDERAL REGULATCNS DOCKET NO. 50-423 TAC M98860 On September 26,1996, Northeast Nuclear Energy Company (NNECO) informed the NRC, pursucnt to Section 50.72(b)(2)(iii)(D), that it had idt.n.ied 21 safety-related air operated valves (AOVs) that are controlled by solenoid operated pilot valves (SOVs), which do not receive Class 1E power. The 21 SOV/AOV control switches, whose failure could affect safety system capability, were not included in the Millstone Unit 3 quality assurance program. During subsequent revisions to Licensee Event Report (LER) 96-036-00 and onsite review of NNECO's corrective actions following the submittal of the LER, it is the understanding of the NRC staff that the NNECO review has identified approximately 114 valves that are affected.

1.

i Following an internal review, NNECO identified that for 62 of the valves, engineering analysis has determined that the position of the valves is of no consequence during design basis events, in additio,i, NNECO identified 4 valves that have an active safety

' metion imd it is the NRC's understanding that these valves will be upgraded to safety-related status prior to Mode 4. For the above mentioned 66 valves, confirm that the NRC's understanding of the valves disposition is correct.

2.

For 32 of the remaining 48 valves, it is the NRC's understending that the valves are in the fail safe position and must remain in the fail safe de-energized position during design basis events to support proper operatior of the associated safety-related system. These valves are also exposed to harsh environmental conditions during design basis events.

a. It is the NRC's understanding that these 32 valves are being modified to eliminate the potential failures associated with exposure to harsh environmental condithns.

Please confirm that the NRC's understanding !s correct.

b. For the 32 valves, list the valves (and the system they are in) which are in redundant trains and which valves are in nonredundant trains.

c. For the valves in redundant trains, describe why a single random failure of a raceway (or failure of one of the circuits routed in the raceway) containing redundant nonsafety control circuits (in conjunction with a design basis event) will not credibly cause failure (i.e., opening) of more than one cf many fail-safe AOVs located in redundant safety systems.

d.

For the valves in nonredundant trains, describe why a random failure (i.e.,

opening) does not have to be assumed concurrent with a design basis event (include a discussion of what failures you conclude are noncredible).

Enclosure w . -

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3. For 8 of the 48 valves, it is the NRC's understanding that the valves are in the fail safe position and must remain in the fall safe de-energized position during design basis events to support proper operation of the associated safety-related system. These valves are not exposed to harsh environmental conditions during des!gn basis events.

- a. For the 8 valves, list the valves (and the system they are in) which are in

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redundant trains and which valves are in nonredundant trains.

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b. For the valves in redundant trains, describe why a single random failure of' a b

raceway (or failure of one of tne circuits routed in the raceway) containing '

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! redundant nonsafety control circuits (in conjunction with a de:Ign basis event) will ;

_ not credibly cause failure (i.e., opening) of more than one of many fail-safe AOVs

_ located in redundant safety systems, i

c. For the valves in nonredundant trainr, describe'why a random failure (i.e.,

opening) does not have to be assumed concurrent with a design basis event.

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4. ' Fer 8 of the 48 valves, which are in the post-accident sampling system (PASS), NNECO '

is modifying the valves to eliminate potential failure modes associated wid exposure lo harsh environmental canditions, to assure post-accident operability of the PASS system function The position of these valves is of no significance during any design basis event.

Please confirm that the NRC's understanding is correct, if not, please provide similar -

I- responses to questions 3a through 3b.

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