ML20214J021
| ML20214J021 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 11/13/1986 |
| From: | Cutter A CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-86-003, IEB-86-3, NLS-86-422, NUDOCS 8612010121 | |
| Download: ML20214J021 (4) | |
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SERIAL: NLS-86-422 Dr. J. Nelson Grace, Regional Administrator United States Nuclear Regulatory Commission 101 Marietta Street, NW Atlanta, GA 30303 SHEARON HARRIS NUCLEAR POWER PLANT DOCKET NO. 50-400/ LICENSE NO. NPF-53 RESPONSE TO IE COMPLIANCE BULLETIN 86-03
" POTENTIAL FAILURE OF MULTIPLE ECCS PUMPS DUE TO SINGLE FAILURE OF AIR-OPERATED VALVE IN MINIMUM FLOW RECIRCULATION LINE"
Dear Dr. Grace:
Per the requirements of IE Compliance Bulletin 86-03, Carolina Power & Light Company (CP&L) hereby submits the results of our review of the Shearon Harris Nuclear Power Plant,(SHNPP) Emergency Core Cooling System (ECCS). The subject bulletin required that it be determined whether a licensee's facility has a single-failure vuinerability in the minimum flow recirculation line of any ECCS pump which could result in the failitre of more than one ECCS train. Should this problem exist, corrective actions are to be developed and implemented to bring the facility into compl%ce with GDC 35. A written report providing the results of the review, a justification for continued operation, and a description of the short-term corrective actions are to be submitted within 30 days of receiving the bulletin. In addition, a report detailing the long-term corrective actions is to be submitted within 90 days of receipt of the bulletin.
This inforniation is being submitted within the time frame as discussed by Mr. S. R.
Zimmerman (CP&L) and Mr. P. E. Frederickson of your staff on November 12,1986. This submittal provides the results of CP&L's review of the SHNPP ECCS per Action 1 of the l
bu!!etin. The attached information is formatted such that the specific sub-headings correspond to the bulletin action items.
Per ocr review, CP&L has determined that SHNPP is not susceptible to the disablement i
of multiple ECC5 pumps due to a minimum flow line single failure. Therefore, the bulletin requirements have been completed and no further action needs to be taken by SHNPP.
8612010121 861113 PDR ADOCK 05000400 G
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411 Fayetteville Street
- P. O. Box 1551
- Aale gn. N C. 27602 M3MMM
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Unit::d Stnt:s Nucirr Regulatory Commission NOV 131986
.NLS-86-422 / Pag 3 2 Should you have any questions with regard to this submittal, please contact Mr. Arnold Schmich at (9193 836-8759.
Yo s very tru ll A. B. Cutter - Vice Presi t
Nuclear Engineering & Licensing AWS/bmc (5056AWS)
Attachment cc:
Mr. B. C. Buckley (NRC)
Mr. G. F. Maxwell (NRC-SHNPP)
U.S. NRC Document Control Desk A. B. Cutter, having been first duly sworn, did depose and say that the information contained herein is true and correct to the best of his information, knowledge and belief; and the sources of his information are officers, employees, contractors, and agents of Carolina Power & Light Company.
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RESPONSE TO NRC IE COMPLIANCE BULLETIN 86-03 The following sections provide specific detail on each of the IE Compliance Bulletin 86-03 action items:
NRC Action 1:
Promptly determine whether or not your facility has a single-failure vulnerability ir. the minimum flow recirculation line of any ECCS pumps that could cause a failure of mere than one ECCS train.
CP&L Response:
A review was conducted of the Chemical Volume Control System (CVCS) and the Resicual Heat Remot c (RHR) System which comprise the SHNPP ECCS. The CVCS and the RHR Syt+em were reviewed to determine the following information:
a.
Do the system pumps have a common recirculation line?
b.
If yes, could a valve cause a violation of the single-line failure criteria?
c.
Cauld the accident logic of the pump recirculation line valves cause pump damage by isolating multiple pump recirculation?
The results of this review indicate that the CVCS uses a common recirculation line during normal plant operation. However, on receipt of a Safety Injection Actuation Signal the common recirculation line isolates and redundant recirculation lines open for pump protection. The RHR System has no common recirculation line and no common mode logic faults. CP&L, therefore, concludes that SHNPP is not susceptible to the disablement of multiple ECCS pumps due to a single failure of a minimum flow recirculation line valve.
NRC Action 2:
If the problem exists: (a) promptly instruct all operating shifts of the problem and measures to recognize and mitigate the problem, and (b) promptly develop and implement corrective actions which bring your facility into compliance with GDC 35.
CP&L Response:
This action is not necessary since the problem described in the bulletin does not apply to SHNPP.
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NRC Action 3:
Within 30 days of receipt of this bulletin: (a) provide a written report to the NRC which identifies whether or not this problem exists at your facility; and (b) if the i
problem exists (or existed), include in the report the justification for continued operation, and identify the short-term modifications to plant operating procedures i
or hardware that have been or are being implemented to ensure safe plant j
operations.
CP&L Response:.
This information is being submitted within the time frame as discussed by Mr. P.
E.Frederickson (NRC-Ril) and Mr. S. R. Zimmerman (CP&L) on November 12, 1986. Since this problem is not existent at SHNPP, a justification for continued operation and a description of short-term corrective modifications is not necessary.
NRC Action 4:
If the problem exists (or existed), provide a written report within 90 days of receipt of this bulletin informing the NRC of the schedule for long-term resolution of this and/or any other significant problems that are identified as a result of this bulletin.
CP&L Response:
Since the problem described in this bulletin does not exist at SHNPP, this action is not necessary.
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