ML20093H808
| ML20093H808 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 10/10/1984 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| 2NRC-4-162, NUDOCS 8410160390 | |
| Download: ML20093H808 (3) | |
Text
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'Af h gg 2NRC-4-162 u
A-(412)787-5141 Nuclear Construction Division Telecopy Robinson Plaza, Building 2 Suite 210 Pittsburgh, PA 15205 October 10, 1984 United States Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Mr. George W. Knighton, Chief Licensing Branch 3 Office of Nuclear Reactor Regulation
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 PSB Electrical Outstanding Issues Gentlemen:
Attachment I to this letter provides a response to outstanding issue 196 of the BVPS-2 draft SER Section 8.3.3.1.1.
This response addresses those points requested by the reviewer in a meeting in August.
DUQUESNE LIGHT COMPANY By E."J. Woolever Vice President GLB/wjs Attachment cc:
Mr. H. R. Denton, Director (NRR) (w/a)
Mr. D. Eisenhut, Director Division of Licensing (w/a)
Mr. J. Knox (w/a)
Ms. M. Ley, Project Manager (w/a)
Mr. E. A. Licitra, Project Manager (w/a)
Mr. G. Walton, NRC Resident Inspector (w/a)
SUBSCRIBEDANDSpRNTOBEFOREMETHIS
/ d DAY OF
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- 1984, duA dLIN'A Notary Public ANITA ELAINE REITER, NOTARY PUBLIC ROBINSON TOWNSHIP, ALLEGHEMY COUNTY MY COMMIS$10N EXPIRES OCTOBER 20,1936 8410160390 841010 PDR ADOCK 05000412 E
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Unittd'Stctas Nuc1 car R3gulatory Commission Mr. G;org2 W. Knighton, Chief Page 2 COMMONWEALTil 0F PENNSYLVANIA )
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COUNTY OF ALLEGHENY
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On this
/
day of
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_, before me, a Notary Public in and for said Commonwealth and County, personally appeared E. J. Woolever, 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 fo rth in the Submittal. are true and correct to the best of his knowledge.
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Notary Public ANITA ELAINE REITER, NOTARY PUBUC ROBINSON TOWNSHIP, ALLEGHENY COUNTY MY COMMISSION EXPIRES OCTOBER 20,1986
ATTACHMENT 1 Response.to Outstanding Issue 196 of the Beaver Valley Power Station Unit No. 2 Draft Safety Evaluation Report Draft SER Section 8.3.3.1.1:
Submerged Electrical Equipment as a Result. of a Loss-of-Coolant Accident It is the staff's concern that following a loss-of-coolant accident, fluid (from the reactor coolant system and from operation of the emer-gency core cooling systems) may collect in the primary containment and reach a level that may cause certain electrical equipment located inside the containment to become submerged and thereby rendered inoperable.
Both safety and nonsafety-related electrical equipment is of concern because their failure may cause electrical faults that would compromise the. operability of redundant emergency power sources or the integrity of containment electrical pe netrat ions.
In addition, the safety-related electrical equipment that may be subme rged is also of concern if this equipment is required to mitigate the consequences of the accident for l
both the short-term and long-term emergency core cooling system func-l tions and for containment isolation.
The staff's position, in regard to submerged equipment, is that all electrical equipment must be located above the maximum possible flood level or be qualified for submerged operation, or the lack of qualifica-
[
tion must be justified.
By Amendment 3 to the FSAR, the applicant provided a listing of _ safety I
class equipment that may become submerged as a result of a LOCA and are not designed and qualified for submergence.
In justification of the lack of qualification, the applicant stated that the design of the Class IE distribution system satisifies the isolation criteria by ensuring that the failure of the submerged equipment will not degrade the Class IE power so urce.
Clarification of the isolation criteria and how it ensures that Class IE systems will not be degraded will be pursued with the applicant and the results of the staf f review will be reported in a supplement to this report.
Response
All Class 1E electrical equipment which may become submerged as a result of a LOCA, as listed in the response provided for 430.18, Amendment 3, is electrically tripped, disconnecting its Class IE power source by a high flood level indication.
The Class IE level transmitters providing the sensing and instrumentation for this high flood level indication will be qualified for submergence.
Two Class IE sensors (orange and
-purple train-related) will be 1 coated below the Class IE electrical equipment, which may become submerged as a result of a LOCA.
Figure 7.4-27 shows a typical system logic for this tripping function.
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