ML19331C922
| ML19331C922 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 06/12/1980 |
| From: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 1-060-14, 2-060-19, IEB-80-12, NUDOCS 8008200123 | |
| Download: ML19331C922 (3) | |
Text
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t ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551. UT'LE ROCK. ARKAY;AS 72203 (500 371-4422 WILUAM CAVANAUGH ill June 12, 1980 Vice Presioen-Generacon G Cons::vedon 1-060-14 2-060-19 Mr. K. V. Seyfrit, Director Office of Inspection & Enforcement U. S. fluclear Regulatory Cormission Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011
Subject:
Arkansas Nuclear One - Units 1 & 2 Docket Nos. 50-313 and 50-368 License Nos. DPR-51 and NPF-6 IE Bulletin No. 80-12 Decay Heat Removal System (DHRS)
Operability (File:
1510.1,2-151].1)
Gentlemen:
In accordance with Item 7 of the subject bulletin, the following is provided under 10 CFR 50.54(f).
Item a.
Changes to procedures (e.g., emergency, operational, administrative, maintenance, refueling) made or initiated as a result of your reviews and analyses, including the scheduled or actual dates of accomplish-ment.
(Note:
NRC suggests that you consider the following.
(1) limiting maintenance activities to assure redundancy or diversity and integrity of DHR capability, and (2) bypassing or disabling, where applicable, automatic actuation of ECCS recirculation in addition to disablic.g High Pressure Injection and Containment Spray preparatory to the cold shutdown or refueling mode.)
Response
In accordance with Items 1 and 2 of this bulletin, reviews of the Davis-Besse event and of all DHR degradation events, for which documentation exists, at ANO-1 and 2 has been completed.
In addition to these reviews, analyses of our procedures for adequacy of safeguarding against loss of DHR capability and for adequacy of responding to DHR loss events are now being perfomed. We expect to complete these analyses by August 15, 1980.
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In response to Item 6, procedure revisions necessary in order to ensure that removal of decay heat from the RCS is accomplished as necessary will be implemented by ' uly 7,1980.
Consideration will be given to J
the NRC suggestions given above in our reviews and procedure revisions.
Item b.
j The safeguards at your facility (ies) against DHR degradation, including vour assessment of their adequacy.
i Response - ANO-1 3
In order to address Items 4, 5, and 6 of this bulletin, the hardware
- apability of A!i0-1 to prevent DHR loss events has been and is continuing j
to be reviewed. Also, our letter dated August 3,1976, to D. Ziemann of your staff presented our analysis to demonstrate that the Emergency Core Cooling System and subsystems meet the single failure criterion pursuant I
to the requirements of 10 CFR 50.46.
Because parts of the ECCS system are also used for DHR, we feel that this analysis, plus the reviews a
being performed to address Items 4, 5, and 6, adequately addresses the concerns expressed in this bulletin.
Response - ANO-2 The ANO-2 FSAR states in Section 9.3.6 that:
"No single failure of an 4
active component during residual heat remov'al will result in permanent loss of cooling capability." And:
"A single failure of a passive com-ponent in the low-pressure portion of the Shutdown Cooling System during residt I heat removal may result in the interruption of the cooldown but 3
will not result in a loss of core cooling." The Safety Evaluation per-formed in support cf these statements is included in Section 9.3.6.
We feel that this evaluation, along with the reviews being done in response to Items 4, 5, and 6, is sufficient to address the concerns of this bulletin.
Very truly yours,
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s William Cavanaugh, III/
/v WC: MAS:skm cc: Mr. Victor Stello, Jr., Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
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STATE OF ARKANSAS
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COUNTY OF PULASKI
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William Cavanaugh III, being duly sworn, states that he is Vice President, Generation & Construction, for Arkansas Power & Light Company; that he is authorized on the part of said Company to sign and file with l
the Nuclear Regulatory Commission this Supplementary Infomation; that he i
has reviewed or caused to have reviewed all of the statements contained i
in such infomation, and that all such statements made and matters set I
forth therein are true and correct to the best of his knowledge, infoma-tion and belief.
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v William Cavagaugh III SUBSCRIBED AND SWORN T0 before me, a Notary Publ'c in and for the CountyandStateabovenamed,this48-dayof L/4L.C/ 1980.
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