ML20005D679
| ML20005D679 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 12/04/1989 |
| From: | Sieber J DUQUESNE LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| RTR-REGGD-01.097, RTR-REGGD-1.097 NUDOCS 8912140106 | |
| Download: ML20005D679 (2) | |
Text
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SNppngport PA 15077h4 JOHN D SIEBE R JS tW UM vee 5% scent N aw Gro4 December 4, 1989 U.
S.
Nuclear Regulatory Commission Attn:
Document Control Desk Washington, DC 20555
Reference:
Beaver Valley Power Station, Unit No. 1 and No. 2 BV-1 Docket No. 50-334, License No. DPR-66 BV-2 Docket No. 50-412, License No. NPF-73 Regulatory Guide 1.97 Rev.
2, Additional Information Submittal Gentlemen:
The purpose of this letter is to provide clarifying information on Regulatory Guide (R.G.) 1.97 redundancy criteria as applied to instrumentation for Beaver Valley Power Station Unit 1 (BVPS-1) and Unit 2
(BVPS-2).
The instrumentation for the wide range reactor coolant system hot and cold leg temperatures (T Hot and T Cold) are addressed.
We received the NRC Region I
letter referring to Combined Inspection Nos. 50-272/89-13 and 50-311/89-12 for Salem Generating Station Units 1 and 2.
Subsequently, we initiated a review of the items discussed in the letter for their relevance to Beaver Valley Ptuer Stations.
We also initiated an internal audit for R.G.
1.97.
While still in the early stages of these actions, NRC Region I
announced that a R.G.
1.97 inspection would be conducted for BVPS-1 and
-2 the week of December 4, 1989.
Although our review relating to the NRC inspection report is preliminary, we have a
concern with the interpretation of R.G.
1.97 redundancy requirements.
Therefore, we believe it is necescary to clarity our understanding of this issue.
The concern focuses on the wide range T Hot and T cold which have one instrument channel per each of three loops.
The three instrument channels of T
Hot are on a single vital bus and the three instrument channels for T
Cold are on another vital bus.
These channels do not provide inputs to the reactor protection system.
For this instrumentation, we based the conformance for the redundancy criteria of R.G.
1.97 on the instrumentation for the variables discussed in the letter to the NRC from the Westinghouse Owners
- Group, OG-94 (Revised), dated June 14, 1983, "Requiraments of Reactor Coolant Temperature Indication".
A912140106 891204
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- ,$Be vsr Valley Powsr Station, Unit No3.
1&2
' Docket-No. 50-334, License No. DPR-66 Docket No. 50-412, License No. NPF-73 Regulatory Guide 1.97 Submittal of Additional Information Page 2 i
specifically, for T Hot we take credit for the core exit thermocouples as diverse indication; for T
- Cold, the steam generator pressure indication which provides a known relationship of cold leg temperature for
-the saturation temperature corresponding to steam generator pressure provides redundancy.
In either case, T Hot or T cold, the diverse instrumentation channels are on different vital buses.
Additional information on these variables are provided in our R.
G.
1.97 reports.
In
- addition, we have recently received the Safety Evaluation for the BVPS-1 Conformtnce to R. G.
1.97.
It is apparent that the evaluation did not acknowledge Beaver Valley 1
electrical separation in that the full requirements of R.
G.
1.75, as detailed in our letter dated October 13, 1986 are not met.
We will provide copies of this letter to the Region I
Inspection Team during the week of December 4, 1989.
If you have any questions regarding this submittal, please contact myself or members of my staff.
Very truly yours,
}u..
J.
D. Sieber cc:
Mr. J.
Beall, Sr. Resident Inspector Mr. W. T.
Russell, NRC Region I Administrator l
Mr.
P. Tam, Sr. Project Manager
.Mr. R.
Saunders (VEPCO) l-l l
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