ML20044A163

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Requests That NRC Continue Processing Exemption Request for Configuration of wide-range Nuclear Instrumentation Cables in Fire Area 34B (Upper Electrical Penetration Room). Emergency Boration Added to Achieve Safe Shutdown
ML20044A163
Person / Time
Site: Fort Calhoun Omaha Public Power District icon.png
Issue date: 06/22/1990
From: Gates W
OMAHA PUBLIC POWER DISTRICT
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LIC-90-0516, LIC-90-516, NUDOCS 9006280148
Download: ML20044A163 (2)


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Omaha Public Power District 1623 Harney Omaha. Nebraska 68102 2247 402/536 4000 June 22, 1990 1.10 90 0515 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Station PI 107 Washington, DC 20555

References:

1. Docket No. 50 285
2. Letter from OPPD (W. G. Gates) to NRC (Document Control Desk)datedFebruary 21,1990(LIC-89-1203)

Gentlemen:

SUBJECT:

Additional Information on Exemption Request for Fire Area 34B In Reference 2, Omaha Public Power District (0 PPD) submitted a request for

! exemption from cortain requirements of 10 CFR Part 50, Appendix R, regarding I

the configuration of the wide range nuclear instrumentation cables in Fire Area 34B (upper electrical penetration room). This exemption is based upon the i extremely low probability of a fire damaging all four nuclear instrumentation l

channels at once. Such a fire is improbaWe as limited combustibles, physical separation, and area-wide detection allow prompt manual sup)ression of any fire that would occur. Emergency boration is an added aid to ac11eving and maintaining safe shutdown if a fire would occur in Fire Area 348.

In Paragraph B.(4) of OPPD's exemption request, OPPD stated that " actions described in... Abnormal Operating Procedures (A0Ps) required to maintain safe shutdown of the plant will not be negatively affected by the potential loss of core monitoring capability due to a fire in the upper electrical penetration room". NRC reviewers questioned whether existing AOPs require sampling to verify boron concentration. Applicable A0Ps and E0Ps to this scenario do not require sampling for boron. concentration. Procedures direct plant operators to trip the reactor and to emergency borate using the boric acid storage tanks and, if necessary, switch to the Safety Injection Refueling Water Tank (SIRWT)

.as a source of boric acid. Emergency boration would continue until the calculated shutdown margin, based on the quantity of boric acid injected into the Reactor Coolant System (RCS), meets applicable requirements. .:

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,, . .4 U. S. Nuclear Regulatory Commission LIC-90 0516 Page 2 OPPD, therefore, respectfully requests that the NRC continue processing the Exemption Request for Fire Area 34B as submitted in Reference 2. If you should have any questions, please contact me.

Sincerely.

W.G. Gates [(r)

Division Manfger Nuclear Operations WGG/sel c: LeBoeuf, Lamb, Leiby & MacRae A. Bournia, NRC Project Manager R. D. Martin', NRC Regional Administrator, Region IV P. H. Harrell, NRC Senior Resident inspector

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