ML20037B094
| ML20037B094 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 06/17/1977 |
| From: | Bolger R COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20037B091 | List: |
| References | |
| NUDOCS 8009030801 | |
| Download: ML20037B094 (3) | |
Text
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CommInwsilth Edis n One F rst National Ptars. Chicago, lltinois Address Reply to: Post Office Box 767 Chicago, minois 60690 June 17, 1977 Mr. James G. Keppler, Director Directorate of Inspection and Enforcement - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137
Subject:
Dresden Station Units 1, 2, and 3 Response to IE Inspection Report Nos. 50-10/77-10, 50-237/77-11, and 50-249/77-11 NRC Docket Nos. 50-10/237/249 Reference (a):
J. M. Allan letter to B. Lee, Jr.,
dated May 26, 1977.
Dear Mr. Keppler:
[
Attached to thic letter is Commonwealth Edison's response to the items of noncompliance noted in Appendix A of Reference (a).
Please direct any additional questions concerning this mutter to this office.
Very.truly yours, R. L. Bolger Assistant Vice President Attachment 8000080.[O/
JW 31 1977,
Commonwealth Edison NRC Docket Nos. 50-10
- ]D 33 A
50-237 D*
D o
Ju 2-d Ju 22 Attachment 50-249 Infractions:
1.
Contrary to Technical Specification 3.8.A.2.b, releases of halogens and particulates (with half-lives longer than eight days) from the station execeded the relcace rate limit during the period April 15 at 0930 hours0.0108 days <br />0.258 hours <br />0.00154 weeks <br />3.53865e-4 months <br /> to April 16, 1977, at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br />.
2.
Contrary to Technical Specification 6.6.B.1, releases of halogans and particulates (with half-lives longer than eight days) exceed the release rato limit (a limiting condition for operation) during the period April 15 at 0930 hours0.0108 days <br />0.258 hours <br />0.00154 weeks <br />3.53865e-4 months <br /> to April 16, 1977, at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br />, werc not reported to the NRC until April 22, 1977, a period of time greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
Discussion:
Releases of halogens and particulatos slightly exceeded the Technical Specification release rato limit for the period in question.
The Unit 1 iodine rolcase rate was 103% of the Technical Specification ibnit.
The increased iodine release rate was caused by the reactor cleanup demineralizer system being out of service.
Difficulties encountered in switching from "A"
to "B" cleanup-resulted in'the system being off line longer than anticipated.
The increased iodine release rate was not reported until April 22, 1977, because a 7-day delay is necessary to obtain an accurate estimate of the 1-131 activity.
Corrective Action:
1 "B" reactor cleanup system was placed in service as soon as possible.
On April 22, 1977, "D" secondary steam generator was I
taken out of service to further reduce the iodine release of Unit 1.
"D" secondary steam generator had a 30,000 lb/hr primary to secondary leak which was contributing to the increased iodine release.
In addition, all Unit 1 iodine samples capable of being analyzed were counted on the Ge(Li) system bcfore the seven day decay period had l
elapsed.
The Go(Li) analy=cr results indicated the I-131 release rate had stabilized at 6 X 10-7 uCi/sec or 25% of Technical Specification ihaits.
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Commonwealth Edison NRC Docket Nos. 50-10 Sgg 50-237
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corrcetive Action to Avoid necurrence:
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In order to insure a nore timely monitoring of release rates, lodine samples will be counted at apprcximately 24 and 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> following sampling to estimate the iodine activity level.
If the sample is over a predetermined limit, the I-131 activity will be further quantified.
t Date of Full Complianec:
The station believes that full compliance has been achieved, however, the action levels for the 24 and 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> counts are being developed at the present time and should be finalized I
by August 1, 1977.
During this interim pariJd, estimates of the iodine activity are made at approximately three days after the initial sampling period in addition to waiting for the' 7-day count.
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