ML20203F950
| ML20203F950 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 04/22/1986 |
| From: | Carey J DUQUESNE LIGHT CO. |
| To: | Tam P Office of Nuclear Reactor Regulation |
| References | |
| 2NRC-6-039, 2NRC-6-39, NUDOCS 8604280186 | |
| Download: ML20203F950 (5) | |
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g 86 United States Nuclear Regulatory Comission Washington, DC 20555 ATTENTION: Mr. Peter Tam, Project Manager Division of PWR Licensing - A Office of Nuclear Reactor Regulations
SUBJECT:
beaver Valley Power Station - Unit No. 2 Tbcket No. 50-412 Clarification Of Responses To PSB Outstanding Issues
REFERENCE:
(a) Letter No. 2NRC-5-123, dated August 26, 1985.
DLC response to PSB Outstanding Issues.
Gentlemen:
Recent consideration of the responses provided in Attachments 4 and 5 of Reference (a) has caused us to provide the following clarifications.
This response states that upon an automatic start of the ener-gency diesel generators, the operator verifies availability of offsite power and "immediately" returns the units to standby.
The term "immediately" should be construed to mean "as soon as the energency operating procedures permit".
It is not intended to indicate that the operator's first priority is to return the units to standby.
It is intended to indicate that this action normally takes place in a short time period far less than the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> limit required by the vendor.
This clarification appears to have no impact on the staff's SER.
In response to a concern about overloading an emergency diesel generator by connecting a " swing" load and its counterpart to the same bus simultaneously, DLC replied that administrative controls will preclude such a connection.
This should be under-stood to mean that the procedure requires assessment of the loads on a diesel generator bus prior to manual connection of any additional loads.
DLC does not intend to prohibit this simultaneous connection under conditions where an overload will not result and single failure criteria or technical 8604200186 060422 PDR ADOCK 05000412 PDR pd E
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Unit States Nuclear Regulatory Comission Mr. Harold R. Denton, Director Claification Of Responses To PSB Outstanding Issues Page 2 specifications are not affected.
This provides additional operating flexibility and does not impair safety.
The staff's SER (Section 8.3.1.15) appears to require a corresponding change.
DUQUESNE LIGHT COMPANY Sy J."J. Carey 7
Vice President GLB/ sip NR/GLB/PSB/ISSU
- Attachment cc:
Mr. W. Troskoski, Senior Resident Inspector -w/ attachment Mr. L. Prividy, NRC Resident Inspector
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United States Nuclear Regulatory Commission Mr. Harold R. Denton, Director Clarification Of Responses To PSB Outstanding Issues Page 3 COMMONWEALTH OF PENNSYLVANIA 1i SS:
COUNTY OF BEAVER h
On this
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, before me, a Notary Public in and for said Comdionwealth and County, personally appeared J.
J. Carey, who being duly sworn, deposed and said that (1) he is Vice President of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal on behalf of said Company, and (3) the statements set forth in the Submittal are true and correct to the best of his knowledge.
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/M Notary Public SHEILA U. FATTO2E, NOTA:tY PUCUC SWP!NGPORT SOE, BEW,iR COUNTY r ' N.nis$l02 EI:t>G WT. 23. IMS r
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AETACHMENT 4 Outstanding Issue 8(c):
Section 6.4.-2 c4 Institute of Electrical and Elect ronics Engineers (IEEE) 387-1977 ' requires, in part, that the load acceptance test cons ide r the potential ef fects on load acceptance af ter prolonged no-load or light-load ope rat ion of the diesel ge ne rato r.
A load acceptance test or antaysis that demons t rat es the capability of the diesel ge ne rato r to accept the design accident load sequence af ter proloaged no-load operation will be pursued with the applicant, and the results will be reported in a supple-ment to this SER.
Response
In respanse to questions 430.25, 430.54, and 4 30.92, DLC has explained the following:
(a) BVPS-2 procedures req.ai r.e loading of the diesels to at least 25%
daring testing or reaintensnce.
(b) W o the liesals start automatically, the operator verifies availabil-icy of offsite powe r and immediately returns tue units to standby.
Ais limits unloaded running to a very short time period.
(c) The vendor recommends clearing the engine after 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of unloaded running.
Since BVPS-2 operating pract ices limit the accumulated unloaded running time to far less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> each nunth and the diesel is cleared monthly during testing, the diesels will be operated f ar mo re conserva-tively than recommended by the vendor. The attached telex from the vendor documenta the ability of the diesels to support the loading sequence following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of unloaded running.
A 'TACHMENT 5 Oatstanding issue 8(d):
FSAR Section 8.3.L.1.4 and Table 8.3-3 indicate that for a number of Class 1E loads there is a replacement load provided to a'. low maintenance to be pe rfo rmed wh ile satisfying the single failure criterion.
The Be ave r Valley design is such that Class LE load and its replacement may be con-nected t> the s ame Class LE powe r supply at the saw time.
It is the staf f's concern that this simultaneous connection of loads will exceed the capacity of the Class 1E power supplies.
Identification of loads involved and design provisions to preclude simultaneous connections will he pursued with the applicant, and the results of the staf f's review will be reported in a supplement to this SER.
Response
The following electrical lo ad s, classified as swing loads (train colored "gr e e n"), are able to be electrically connected to either the Class LE orange or parple bus as de scribed in FSAR Sect ion 8. 3.1.1.4 and are depicted on Figure 8.3-1:
1.
2CHS*P21C (Charging Pump), 4,160 V Class LE 2.
2CCP*P2LC (Primary Component Cooling Pump), 4,160 V Class IE 3.
2SWS*P2LC (Service Water Pump), 4,160 V Class LE 4
2HVR*FN20lC (Containment Air Recirculation Fan), Tripped on CIB Signal (Refer to FSAR Tablo 8.3-2), 480 V Non-Class LE These swing loads are utilized as replaceme nt loads and will be connected to that one bus which has lost its primary la+1 d2e to f ailure or mainte-nance.
in that case, an exactly equivalent load is substituted.
Admin is-trative procedures will be written to preclude operator connection of any two similar loads on one bus, e.g., both A and C pumps on the orange bus or B and C pumps on the purple bus.
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