ML17252B321

Letter Advising Intended Corrective Action Concerning Items Noted in Paragraph 5 of Form AEC-592 on 11/25/1970 - Dresden Unit 2

ML17252B321
Person / Time
Site:	Dresden
Issue date:	12/16/1970
From:	Brian Lee Commonwealth Edison Co
To:	Grier B US Atomic Energy Commission (AEC)
References
AEC-592
Download: ML17252B321 (4)

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UNITED ST A TES ATOMIC ENERGY COMMISSION DIVISION OF COMPLIANCE I. LICENSEE Comm.om~ealtb Bdlson Company 72 West ~

Stteet Cb:l~goi,

• iiU~o~s 60690

3. LICENSE NUMBER cket* No. S0*237

2. REGIONAL OFFICE

.Region Ill. l>ivlsion of CQinpiiauce

u. $* Atomic Enefgy Ccxnmission 799 Roosevelt lload (Uen Bllyn. l~llnois (i0137

4. DATE(S) OF INSPECTION October 29.1970

5. The following activities under your license (identified in Item Nq. 3 ab'ove) appear.to be'in f!.Oncompliance with AEC regulations or license requirements, a*s i.ndicated.

Contra17y to h_ragr{lp'hsJ.-1.lha and 3.7."J>.3 of* Appendta A to Operating License J>Pl\\,..19, reacto11 PO'.'J~t operation was*.ccmttnued frOlll October 'i.-7, i970. to Novemb~r 4, 1970; ~th HSIV 1<:*tnop~iable*aE1.sh~ in 1!4ble'3.7.1 a.nd

• without at l~st.0ne'valve in th~ tine close;a.

i.

Paragraph 3. 7'.D.2 of f4>p*d~ A eq.tes: "In 'the event.any tso!attou valve specj;fied.tnTable:3.7.1 betomes in4perable,, ireactor power oper$tlQn may con.tinue* ptovldad at*. least one :valve. *ta eacn 'line ~vtng an -tnopet'able* valve is in tha mode *cone$ponciills to the ~solatet! cQiid~tlon. u I

Paragraph *3.7.D~3.,sb:lte.s lf $peciflc4tion 3_ *. 7"Q. ~ot b~ r:n.et, a r~ctow shutdcrw4 w~lt be in~tiAtect.

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1000,1r I'

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Supplementary page -~N=en=e ____ attached.

11-25-70 AEC Co.mplianca Inspector Date ORIGINAL: LICENSEE.

COPIES: D co REGION D co HEADQUARTERS D LBcR HEADQUARTERS.

882*995 U.S. GOVERNMENT PRINTING OFFICE: 11163-~531 I

Commonwealth Edison Company ONE FIRST NATIONAL PLAZA

• CHICAGO, ILLINOIS Addreu hply to.

POST OFFICE BOX 767 *CHICAGO, ILLINOIS 60690 December 16, 1970 Mr. Boyce H. Grier, Regional Director

. Divis1on of Compliance Reg*ion III

. U.S *. Atomic Energy Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Subject:

Provisional Operating License DPR-19, AEC Dkt 50-237

Dear Mr. Grier:

The purpose of this letter is to advise you of our posi-

_tion and intended corrective action conce~ning the items noted in Paragraph 5 of Form AEC-592 which was forwarded to us on November 25, 1970.

These items appear to be in non-compliance with the terms.of Paragraphs 3.7.D.2 and 3.7.D.3 of Appendix A to our Provisional Operating License for Dresden Unit 2 (DPR-19).

The circumstances surrounding these items were described in a letter from H. K. Hoyt, Superintendent of Dresden Station, to Dr. Peter A.

Mor~is, Director, Division of Reactor Licensing, dated November 27, 1970.

During main steamline isolation valve (MSIV) surveillance te~ting on October 27, 1970, it was found that MSIV-203-1C had a closure time of two seconds.

This time is less than the range for MSIV closure times (three to five seconds) specified in Table 3.7.1 of the Technical Specifications.

On November 5, 1970 Main Steamline ~C" was isolated by closing both MSIV's in this line.

Investigation of MSIV-203-1C following plant shutdown on November 14, 1970 indicated that a loose oil fitting had allowed the escape of oil a~d thus caused the short closure time of the valve.

Following tightening of the fitting and replacement of the oil, the valve was reset to close within the range of three to five seconds.

The decision to continue plant operation with MSIV-203-1C closure time less th~n three seconds and Main Steamline "C" no~

_isolated was based on the fact that Table 3.7.1 lists maximum oper-ating times for containment isolation valves and the three to five second range specified for MSIV's w~s interpreted as a range for maximum MSIV closure times rather than as a permissible range for MSIV closure times.

Furthermore, the average closure time of the faster closing MSIV in each ot the four main steamlines was within the range of three to f~~e sec6nds.and it was felt that the pressu~e transient resulting from simultaneous isolation of all four main steamlines (assuming the as-me~sured MSIV closure times) w*s con-servative relative to the worst case containment isolation pressure transient.

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tltnunonwealrh Edison Companr9 Mr. Boyce H. Grier 2 -

December 16, 1970 This decision was transmitted by the Dresden Station Review Board (SRB) to the Nuclear Revie~ Board (NRB) on November 2, 1970.

At its November 4, 1970 meeting, the NRB concluded that MSIV-203-1C should be considered inoperable per Table 3.7.1 of Appendix A to DPR-19.

This conclusion was transmitted to Dresden

,Station and action initiated immediately to isolate Main Steamline "C", thereby bringing plant operation into conformance wiih Appendix A to DPR-19.

Plant operation with Main Steamline "C" open was resumed following the maintenance described above which brought*

the closure time for MSIV-203-1C within the range of three to five seconds.

To improve the flexibility of plant operation, we are studying the possibility of requesting a change to the Technical Specifications to base the lower limit of MSIV closure times on average, rather than individual,valve closure times.

Until such time as this change is submitted and approved by the Division of Reactor Licensing, Dresden Station has been advised that a main steamline should be isolated during plant operation unless both MSIV~ in that line have closure times in the range of three' to*

five seconds.

Very truly yours,

• • 3c un£~-

Byrfn Lee, J~. U 1

Assistant to the President I