ML20203A523
| ML20203A523 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek  |
| Issue date: | 06/11/1986 |
| From: | Corbin McNeil Public Service Enterprise Group |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-86-001, IEB-86-1, NLR-N86088, NUDOCS 8607170267 | |
| Download: ML20203A523 (4) | |
Text
..
4
~Y Pubbe Service Electric and Gas Cornpany Cor".in A. McNeill, Jr.
Pubhc Senoce Efectnc and Gas Company P.O. Box 236,Hancocks Bndge, NJ 08038 609 339-4800 i
Vice Presider't -
l Nuclea' June 11, 1986-NLR-N8608P U. S.
Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 Attention:
Dr. Thomas E.
Murley, Regional Administrator Gentlemen:
RESPONSE TO IE COMPLIANCE BULLETIN 86-01 HOPE CRECK GENERATING STATION DOCKET NO. 50-354 Public Service Electric and Gas Company (PSE&G) received IE Compliance Bulletin 86-01 on June 2, 1986 and based upon the discr2ssion contained in Attachment 2 of this letter has determined that the Hope Creek Generating Station (HCGS) is not vulnerable to minimum flow logic problems which could disable all four Residual Heat Removal (RHR) pumps.
Pursuant to the directions contained in the subject bulletin,
! contains an affidavit which affirms the conclusions reachea and information contained within this transmittal.
Should you have any questions regarding this information, please feel free to contact us.
Sincerely, N
Attachments L
8607170267 860611 9
PDR ADOCK 05000354 G
PDR g.
\\
V Dr. Thomas E.
Murley, 6-11-86 Regional Administrator C
U.
S. Nuclear Regulatory Commission Document Control Desk Washington, D.C.
20555 Mr.
R.
W.
Borchardt Senior Resident Inspector Mr.
D.
H.
Wagner Licensing Project Manager i
.e
?
ATTACHMENT 1 Ref IE COMPLIANCE BULLETIN 86-01 DOCKET No. 50-354 STATE OF NEW JERSEY
)
)
Ss.
COUNTY OF SALEM
)
4 McNeill, Jr., being duly sworn according to law deposes Corbin A.
.i and says:
I am Vice President of Public Service Electric and Gas Company, and as such, I find the matters set forth in our letter dated June 11,1986 concerning our response to IE Compliance Bulletin 86-01, Docket No. 50-354, is true to the best of my knowledge, information and belief.
i Subscribpd and Sworn,po before me this //
day of W.
1986 f
pu~
sNotary PJublic of New Jersey Y;
p ny My Commission expires on
o
.f*
ATTACHMENT 2 Public Service Electric and Gas Company (PSE&G) has reviewed the Hope Creek Generating Station (HCGS) Residual Heat Removal (RHR)
System and concluded that HCGS is not vulnerable to minimum flow logic problems identified at the Pilgrim Nuclear Power Plant which would disable all four RHR pumps.
The Pilgrim station discovered a scenario in which the loss of the minimum flow bypass valve, which serves their two RHR loops, during an event with a high drywell signal or low water level signal would permit both RHR pumps to start, run dead headed, damage the pumps and in turn disable ECCS and/or shutdown cooling functions.. This scenario is not-credible at HCGS for the following reasons:
1.
The HCGS RHR system consists of 4 RHR pumps, each with its own minimum flow line, bypass valve, flow element, and flow transmitter.
2.
These four channels are physically, electrically and logically independent.
3.
Therefore, a single failure in any-one RHR minimum flow path, including the bypass. valve, will disable only that one RHR loop and hence will not affect any of the three remaining paths.
Therefore, it can be concluded that the Pilgrim scenario is not a credible scenario at HCGS.
For future information consult P&ID M-51-1, Revision 15 (reprinted as FSAR Figure 5.4-13).
I
.