ML20095F065
| ML20095F065 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 08/21/1984 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8408270161 | |
| Download: ML20095F065 (4) | |
Text
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- '*J PHILADELPHIA ELECTRIC COMPANY 23O1 MARKET STREET P.O. BOX 8699 -
PHILADELPHIA PA.19101 (215)841-4502-Vict+R ESID E NT
..............u.c" August 21, 1984 Mr.1 A. Schwencer, Chief Licensing Branch No. 2
-Division of. Licensing U.S. Nuclear Regulatory Conmission Washington,.DC 20555
Subject:
Limerick Generating Station Response to Procedures and Systems Review Branch (PSRB) Questions-i
References:
D. R. Helwig (PECo) telecon with E. Tomlinson (NRC) on August 10, 1984
Dear Mr. Schwencer:
i Our response to PSRB question 430.72 regarding diesel oli storage tank-vent lines is hereby revised to include additional information discussed in the referenced telecon.
Very truly yours, 1M[
j J. S. Kenper DRH/cmv/07258406 Attachment Copy to:
See Attached Service List 8408270161 840821 PDR ADOCK 05000352 A
PDR b*
39-151 /353 I
It
4 cc: Judge Lawrence Bremer (w/ enclosure)
Judge Peter A. Morris (w/ enclosure)
Judge Richard F. Cole (w/ enclosure)
Troy B. Conner, Jr., Esq.
(w/ enclosure)
Ann P. Hodgdon, Esq.
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Mr. Frank R. Rcmano (w/ enclosure)
Mr. Robert L. Anthony (w/ enclosure)
Maureen Mulligan (w/ enclosure)
Charles W. Elliot, Esq.
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Zori G. Ferkin, Esq.
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Mr. Thomas Gerusky (w/ enclosure)
Director, Penna. Emergency (w/ enclosure)
Management Agency i
Angus R. Love, Esq.
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David Wersan, Esq.
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Robert J. Sugaman, Esq.
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Martha W. Bush, Esq.
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Spence W. Perry, Esq.
(w/ enclosure) day M. Gutierrez, Esq.
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Atomic Safety & Licensing (w/ enclosure)
Appeal Board Atomic Safety & Licensing (w/ enclosure)
Board Panel Docket & Service Section (w/ enclosure)
Mr. James Wiggins (w/ enclosure)
Mr. Timothy R. S. Campbell (w/ enclosure)
o DRAF T LGS FSAR QUESTION 430.72 (Section 9.5.4)
Describe your design' provisions made to protect the fuel oil storage tank fill and vent lines from damage by tornado missiles.
RESPONSE
A single above ground fill connection to the fuel oil storage tanks is provided to supply each tank through an underground common header, as shown in Figure 9.5-8, Sheet 1.
Each tank is equipped with a separate above ground vent line.
Both the fill connection and the vent lines extend only a minimal distance above the ground.
In the unlikely event of damage by tornado missiles, the following design features are present in the system to allow continued operation of the diesel generators:
Alternate paths for filling and venting each tank ars a.
f e{N'Y w,N Igg available (e.g., manhole of the tank) h h pf b.
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r ef va,lve/ w ich i locapbd with n the ta I v Ive pi I oid tr'an fe'r p mp/ gr/ ell 's, ont/nued ope ati p esence o thi vafve n
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lin. / Thi vil/c p d-4e-&ls ted-fcr-ths-adosp ee6 y ggg Cross connections are provided in the fuel oil supply and c.
return lines to each diesel to allow any diesel to be supplied from any storage tank.
As an example, if the storage tank "A" fill or vent lines were damaged so as to make the tank unavailable, and diesel generator "B" was not available, the following manual operator actions would be taken (Figure 9.5-8):
valves 1045B and 1101A would be closed and valves 1080A, 10808, 1100A and 1100B would be opened.
The "B" transfer pump would be started and would pump to the "A" day tank.
When the "A" day tank is full, the full flow overflow line would return the diesel oil'to the "B" storage tank.
As noted in Section 9.5.4.2, the day tank holds sufficient fuel for 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> of continuous diesel generator operation at full load; sufficient fuel oil for approximately one hour of full load operation remains at the point where the low level alarm annunciates.
Therefore, credible tornado missile damage to the fill line or a vent line would not affect the safe shutdown of the plant.
430.72-1 Rev. 21, 06/83
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