ML19339A982
| ML19339A982 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 10/24/1980 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 8011060102 | |
| Download: ML19339A982 (4) | |
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S October 24, 1980 Docket No. 50-310 Mr. William Cavanaugh, III Vice President, Generation and Construction Arkansas Power & Light Company P. O. Box 551 Little Rock, Arkansas 72203
Dear Mr. Cavanaugh:
On May 29, 1980, the Cocnission published a proposed rule, a new paragraph 50.48 and Appendix R to 10 CFR Part 50, concerning fire protection, which sets forth the minimum acceptable fire protection requirements necesnry to resolve contested areas of concern for nuclear power plants operating prior to January 1,1979.
We have reviewed all the information you have provided to date regarding your fire protection program.
Several of the open items indicated in our Safety Evaluation Report issued August 22, 1978, remain unresolved. The enclosure presents our position on modifications that would have to be made at your facility to resolve these open items, in a manner that would meet the requirements of the proposed Appendix R.
Sincerely, o ert W. Reid, Chief Operating Reactors Branch f-4 Division of Licensing
Enclosure:
Sunr.ary of Staff Requirements cc w/ enclosure:
See next page 8011060to2 p-
Arkansas Power & Light Company cc w/ enclosure (s):
Mr. David C. Trimble Manager, Licensing Arkansas Power & Light Company P. O. Box 551 Director, Bureau of Environmental Little Rock, Arkansas 72203 Health Services 4815 West Markhar: Street Mr. James P. O'Hanlon Little Rock, Arkansas 72201 General Manager Arkansas Nuclear One P. O. Box 608 Russellville, Arkansas 72801 Mr. William Johnson U.S. Nuclear Regulatory Conrission P. O. Box 2090 Russellville, Arkansas 72801 Mr. Robert B. Borsu:n Babcock & Wilcox Nuclear Power Generation Division Suite 420, 7735 Old Georgetcwn Road Bethesda, Maryland 20014 Mr. Nicholas S.,Reynolds Debevoise & Libennan 120017th Street, k' Washington, DC 20036 Arkansas Polytechnic College Russellville, Arkansas 72801 l
Honorable Ermil Grant Acting County Judge of Pose County Popa County Courthouse Russellville, Arkansas 72831 Mr. Paul F. Levy, Director Arkansas Department of Energy 3003 Kavanaugh Little Rock, Arkarsas 72205 Director, Technical Assessment Division Office of Radiation Progran.s (AU-459)
U. S. Environmental Prctection Agency Crystal Mall #2 Arlington, Virginia 2C460 i
U. S. Environmental Prctection Agency Region VI Office ATTN: EIS COORDINATOR 1201 Elm Street First International Building Callas, Texas 75270
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SUl1 MARY OF STAFF Enclosure REQUIREMENTS TO RESOLVE OPEN ITEMS ARKANSAS NUCLEAR ONE - UNIT 1 DOCKET N0. 50-313 3.2 Separation of Power Cables in Manholes In the SER, it was our concern that an unsuppressed fire in the yard area manholes could affect redundant service water pump power cables. The licensee has not provided the necessary information for our review.
The redundant service water pump cables are located in open trays within the manholes separated vertically by about iwelve inches with no barriers. Ma nua'.
fire suppression would not be adequate to prevent involvement of redundant ser-vice water pump power cables in the event of a fire.
The licensee has indicated that a description of a proposed barrier system for the cables in the manholes will be subnitted during the week of October 19, 1980. Also, the proposed system would be installed at the first shutdown which would permit the installation but not later than the next refueling outage.
If the proposed barrier system is not found acceptable by the schedule established in the new 550.48 of 10 CFR 50, then the licensee will be subject to the requirements of Appendix R to 10 CFR 50.
To meet Section III, Paragraph G of the proposed Appendix R to 10 CFR Part 50, the licensee should provide an alternate shutdown capability independent of this area. The alternate shutdown system should meet the requirements of
'Section L, Paragraph III of propos~ed Appendix R to 10 CFR Part 50.
3.7 Protection of Cable Spreading Room (CSR) Cables In the SER, it was our concern that an unmitigated fire in the CSR could become large enough to affect cables from both redundant divisions.
By letter dated March 13, 1980, the licensee stated that the existing CSR deluge water spray system and detection sistem are adequate to assure that a fire can be detected and suppressed without jeopardizing the capability to safely shut-down the plant. We informed the licensee that the fire protection provided for the CSR was not acceptable.
The licensee has only considered a fire involving shorted electrical cable.
In the event of a transient exposure fire the fire suppression system may not extinguish the fire before the loss of redundant divisions of safe shutdown cables.
The licensee has not demonstrated that adequate protection features have been pro-vided for cables and equipment of redundant systems important to achieving safe shutdown conditions to ensure that at least one means of achieving such conditions survives postulated fires.
To meet our fire protection guidelines, alternate shutdown capability should be pro-vided when safe shutdown cannot be ensured by barriers and detection and suppression systems because of the exposure of redundant safe shutdown equipment, cabling, or components in a single fire area, to an exposure fire, or fire suppression activities, or rupture or inadequate operation of fire suppression systems.
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o To meet Section III, Paragraph G of the propos6d Appendix R to 10 CFR Part 50,
- the licensee should provide an alternate shutdown capability independent of this area. The alternate shutdown system should meet the requirements of Section I, Paragraph III of proposed Appendix R to 10 CFR Part 50.
3.16 Associated Circuits In the SER, it was ouFconcern that a fire involving associated circuits may affect operation of safe shutdown equipment.
By letter dated October 2,1980, the licensee provided information regarding the effect of fires involving associated circuits.
If this information is not found acceptable under current acceptance criteria before the schedule established in 10 CFR 50.48, the licensee will be subject to the requirements of Appendix R to 10 CFR 50.
To* meet Section III, Paragraph 1. of the prorosed Appendix R to 10 CFR Part 50, the safe shutdewn equipcant ind systems for each fire area should be isolated from associated non-safe shutdewn circuitt in the fire area so that hot shorts, open circuits, or shorts to ground in the associated circuits will not prevent operation of the safe shutdown equipment, The separation and barriers be-tween trays and conduits ccntaining asscciated circuits of one safe shutdown division and trays and conduits contain ng associated circuits or safe shutdown cables from the redundant division shall be such that a postulated fire involv-ing associated circuits will not prever.t safe shutdcwn.
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