ML20065E216
| ML20065E216 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 09/24/1990 |
| From: | Drawbridge B PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-89-13, NYN-90176, TAC-74059, NUDOCS 9010020034 | |
| Download: ML20065E216 (6) | |
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NYN 90176 l
September 24, 1990 I
l Uhited States Nuclear Regulatory Commission Washington, DC. 20555
- Attention
Document Control Desk
References:
a)
Facility Operating License NPF 86, Docket No. 50 443 b)
USNRC Generic Letter No. 8913, dated July 18,1989, " Service Water System Problems Affecting Safety Related Equipment" 3
c)
New Hampshire Yankee letter NYN 90037 dated February 9,1990,
" Response to Generic Letter 8913," T.C. Feigenbaum to USNRC r,
d)
USNRC letter dated March 2,1990, " Generic Letter 8913 - Service 1
Water Problems Affecting Safety Related Equipment (TAC No. 74059),"
V. Nerses to E.A. Brown
Subject:
- Supplementasy Response to Generic Letter 8913 l
- Gentlemen:
New Hampshire Yankee (NHY) provided its response to NRC-Recommended Actions I, III, IV and V of Generic Letter 8913 via Reference (c).
The NRC accepted this response in Reference (d) as fulfilling the reporting requirements of the Gencric Letter for l
'those NRC Recommended Actions and looked forward to receipt of a follow-up. report pertaining to NRC-Recommended ~ Action 11.
This letter supplements the original NHY response and completes the actions -
pcrtaining to NRC-Recommended Action II.
The initial thermal performance tests have been completed for the Primary Component Cooling Water (PCCW) Heat Exchangers and l Diesel. Generator Jacket Water (DGJW) Heat Exchangers and a continuing program of periodic retesting of these' heat exchangers has been established. Additionally, NHY has decided to include the PCCW System in the confirmational studies described in the Generic Letter under NRC-Recommended Actions IV and V.
This decision. is the result of our
-evaluation of interpretations contained in Supplement 1 to Generic Letter 8913. Additional details are provided in Enclosure 1.
i 9010020034 900924 PDR ADOCK 05000443 P
PDC New Hampshire Yankee Division of Public Service Company of New Hampshire l' }
P.O. Box 300
- Seabrook, NH 03874
- Telephone (603) 474 9521
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' United States Nuclear Regulatory Commission -
September 24, 1990 Attention: Document Control Desk Page 2 j
l If you have any questions on this matter, please contact Mr. Geoffrey Kingston at (603) 474 9521, Extension 3371.
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- yocrs, Ag/
afo V Bruce '. Drawbri Executive Director -
Nuclear Production TCF:GK/dma cc:
Mr. Thomas T. Martin Regional Administrator United States Nuclear Regulatory Commission rep, Ion I 1
475 Allendale Road King of Prussia, PA 19406 Mr. Noel Dudley NRC Senior Resident Inspector P.O. Box 1149 Seabrook, NH 03874
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P STATE OF NEW HAMPSHIRE Rockingham, ss.
September 24, 1990 Then pctsonally appeared before me, the above named Bruce L. Drawbridge, being duly' sworn, did state that he is Executive Director - Nuclear Production of the 'New Hampshire Yankee Division of Public Service Company of New Hampshire, that he is. duly authorized' to execute and file the foregoing information in the name and on the behalf of L
New Hampshire -Yankee Division of the Public Service Company and that the statements therein are true to the best of his knowledge and belief.
b 1Aku b b umu Beverly E dilloway, Notary' PMic l
My Commission Expires: February 28, 1995 n
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New Hampshire Yankee '
September 24, 1990 f
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'l ENCLOSURE 1 TO NYN 90176 i
t SUPPLEMENTARY RESPONSE TO NRC RECOMMENDED ACTIONS 11. IV AND V OF GENERIC LETTER 8913 9
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New Hampshire Yankee j
September 24, 1990-i 1
SUPPLEMENTARY RESPONSE TO NRC RECOMMENDED ACTION 11 OF GENERIC LETTER 8913 NRC RECOMMENDED ACTION 11:
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' Conduct a test program to verify the heat transfer capability of all safety related heat exchangers_ cooled by service water. The total test program should consist of an initial test i
program and a periodic retest program. Both the initial test program and the periodic retest program should include heat exchangers connected to or cooled by one or more open-cycle systems as defined above.
t In implementing the continuing program for periodic retesting of safety related heat exchangers cooled by service water in open cycle systems, the initial frequency of testing should be at least once each fuel cycle, but after three tests, licensees and applicants should determine the best frequency for testing to provide assurance that the equipment will perform the intended safety functions during the intervals between tests and meet the requirements of GDC 44, 45, and 46. The minimum final testing frequency should be once every 5 years.
A summary of the program should be documented, including the schedule for tests, and all relevant ' documentation should be retained in appropriate plant records.
NHY SUPPLEMENTARY RESPONSE:
At Seabrook Station, four safety related heat exchangers are cooled by the Service Water System. These heat exchangers are listed below:
l Identification Description CC E 17A Train A Primary Component Cooling Water Heat Exchanger CC E 178 Train B Primary Component Cooling Water Heat Exchanger DG E-42A Train A Diesel Generator Jacket Water Heat Exchanger DG E-42B Train B Diesel Generator Jacket Water Heat Exchanger New Hampshire Yankee has completed the initial thermal performance tests on each of these four heat exchangers. ' Baseline data has been collected, analyzed and= compared to-the design performance requirements. The results-indicate that each heat exchanger is unfouled and performing well within design limits, p
New Hampshire Yankee has developed a program to periodically reassess the thermal performance of these heat exchangers. The baseline data collected during the initial thermal
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performance tests has established the acceptance criteria for periodic retests which will be -
performed once per refueling cycle for three consecutive cycles. After three retests,. the periodic retest interval will be evaluated and may be extended not to exceed five (5) years based upon such fact' ors as the extent of heat exchanger fouling.
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New Hampshire Yankee September 24, 1990 Whenever feasible, retests will be performed; prior to commencement of corrective work which could affect heat exchanger thermal performance. Retests will also be performed i
following the completion of corrective work which-could affect heat exchanger thermal performance, if a retest has not been performed within a reasonable period of time prior i
to commencement of corrective work which could affect heat exchanger thermal performance, the periodic retest interval will revert to once per refueling cycle for three cycles followed by evaluation as described above.
A written summary of this heat exchanger periodic retest program including the schedule' for retests is expected to be available on site for review by October 31, 1990.
Other relevant documentation will be retsined in appropriate station records as required by-approved procedures.
SUPPLEMENTARY RESPONSE TO NRC-RECOMMENDED ACTIONS IV AND V i
OF GENERIC LETTER 89-13
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' NRC RECOMMENDED ACTION IV:
Confirm that the service water will perform its intended function in accordance with the licensing basis for the plant. Reconstitution of the design basis of the system is not
- intended. This confirmation should include a review of the ability to perform required safety functions in the event of failure of a single active component. To ensure that the as built system is in accordance with the appropriate licensing basis documentation, this conf;rmation should include recent (within the past two years) system walk down inspections.
This confirmation should be completed before plant startup following the first refueling outage j
beginning nine months or more after the date of this letter. Results should be documented l
and retaincd in appropriab plant records.
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' NRC-RECOMMENDED ACTION V:
Confirm that maintenance practices, operating and emergency procedures, and training that involves the service water system are adequate to ensure that safety related equipment cooled by the service water system will function as intended and that operators of this l
equipment will perform effectively. This confirmation should include recent (within the past 2 years) reviews of practices, procedures, and training modules. The intent of this action is to reduce human errors in the operation, repair, and maintenance of the service water system.
This confirmation should be completed before plant startup following the first refueling outage beginning 9 months or more after the date of this letter. Results should be. documented and retained in appropriate plant records, l
NHY SUPPLEMENTARY RESPONSE:
Supplement 1 to Generic Letter 8913, dated April 4,1990, presented questions and answers read into transcripts of workshops on Generic Letter 8913. Through the answers to the 2
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New Hampshire Yankee September 24, 1990 i'
questions, NRC has provided interpretations 'of original Generic Letter 89-13 recommendations.
One interpretation of Supplement 1 is that NRC Recommended Actions IV and V of Generic Letter 8913 apply to closed loop cooling systems as well as-open loop cooling systems that function to transfer heat from safety related structures, systems and components to the ultimate heat sink.
This interpretation, if adopted by NHY, would have the effect of -
including the PCCW System within the scope of NRC Recommended Actions IV and V of Generic Letter 8913. Reference (c) did not address the PCCW System within the scope of
- NRC Recommended Actions IV and V.
New Hampshire Yankee has considered this
-iu interpretation et Supplement I and decided to include the PCCW System within the scope of NRC Recommended Actions IV and V.
This decision will result in the performance of confirmational studies and reviews of PCCW System design and related procedures, practices and training. The additional studies and reviews will be completed prior to restart following the first refueling outage. This schedule is in conformance with the schedule requested by Generic Letter 8913.
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