ML20085J968

Ao:Supplemental Info to Deviation Rept D-12-3-74-10 Re 3B Control Rod Drive Water Filter Drain Line.Normal Maint Insps & Sys Operational Tests Adequate to Prevent or Minimize Such Failures

ML20085J968
Person / Time
Site:	Dresden
Issue date:	06/11/1974
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085J971	List: ML20085J968 ML20085J972 ML20085J976 ML20085J982
References
419-74, NUDOCS 8310190249
Download: ML20085J968 (2)

Text

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C Address Peply to: Post Ofhce Box 767 Chicago, liknois 60690 BE5 Ltr.f419-74 Dresden Nuclear Power Station R. R. #1 Morris, Illinois 60450 June 11, 1974 80-24g * (%h Cf& 6^

Mr. J. F. O' Leary, Director b h>7 \[hl Directorate of Licensing { gZ -

U. S. Atomic Energy Comission Washington, D. C. 20545 1D-b k /'yj '

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SUBJECT:

LICENSE DPR-25, DRESDEN NUCLEAR PC'4ER STATION. UNIT #3,

• O SUPPLE 12fiTAL REPORT OF AENOR"AL CCCURRENCE.

_3_B Col. TROL ROD DRIVE k'ATER FILTER D2AIN LIl2.

References:

Notification of Region III of AEC Regulatory Operations:

BBS Ltr.#250-74 to Mr. J. F. O' Leary from Mr. B. B. Stephenson dated Apr,il 4, 1974.

Dear Mr. O' Leary:

In response to an off site review of Deviation Report No.D-12-3-74-10 (reference 1) the following supple = ental report is issued. In the opinion of the off alte review: rna Evahiarinne sacrinn did nae e-nbe-ty addreer adequate corrective action to prevent repetition or evaluation of safety implications in light of cumulative experience.

The revised Evaluaticns section follows in its entirety for purposes of clarity. The revisions are underlined.

EVALUATIONS (Supplement to original letter)

This occurrence did not jeopardize the safety of the plant or the public and resulted . in no significant contamination problems. Precautions normally in effect for the area were sufficient.

The imediate action instituted was satisfactory and effective.

The' leak was minor, to the' extent that it was leaking less than a bad valve packing. The fact that it was due to a cracked weld rather than a packing resulted in its classificaticn as an abr.ormal degradation."

However, the safety inplication was identical to a " normal" degradation which is not considered to have serious safety implications.

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1 Mr. J. F. O'Lecry O O3 1t. 1974 i

The nature of the failure is such that norrial maintenance inspect-

! ions and system operational tests are adequate to prevent or minimize

• failures of this type on similar equipment. This occurrence poses no reasons for i limiting future operation of Dresden Unit 3. Because of the nature of the_

l failure, no corrective action __can be ef fected to prevent repetition of the i _ occurrence on this and similar equipment..

Cumulative experience _ regarding miscellaneous contaminated water line Icakn of this nature is ninin11. Because of the insinnificance of this_

_ type _ of failure thov vore not renortable until recentiv. Thus there is no I _ conclusive recorded history available at this time, i

Sincerely,, /.

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B VB. Stephenson Superintendent BBS:JR:do i

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