ML20056B808

Responds to Items Noted on Form AEC-592 Attached to

ML20056B808
Person / Time
Site:	Monticello
Issue date:	05/05/1971
From:	Wachter L NORTHERN STATES POWER CO.
To:	Grier B US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 9102110377
Download: ML20056B808 (3)

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-A a DSSiBIP NORTHERN STATES POWER COMPANY 1 Minneapolis, Minnesota 55401 l 1

1 May 5, 1971 .

Mr. Boyce Grier, Regional Director Fegion Ill, Division of Compliance United States Atomic Energy Commission Glen Ellyn, 111inois 60137 MONTICELLO WCLEAR GENEPATING PLANT License No DPR-22 (Docket No 50-263)

Response to Items Listed on Form AEC-592 Dated pA ril 21, 1971 .

Dear Mr. Grier:

This letter is written in reponse to the items noted on Form AEC-592 which was attached to your letter of April 21, 1971. Your letter, addressed to Leo J. Wachter, Vice President-Power Production and System Operation, referred to:

1. Venting of the Primary Containment Atmosphere (March 10, 1971) and

2. Releases of Liqui d Radwasie (March 13, 1971 and March 15,1971)

The two subjects are discussed separately.

1. Ventino of the Primary Con +ainmni Ainornhere March 10. 1971 The plant conditions and operator actions following the Generator Trip test from 15% power on March 10, 1971 are described in the report sent to Dr. Peter Vorris on March 23, 1971. The following additional information is provided in response to item (a) of Form AEC-592 attached to your A p ril 21, 1971 letter.

( a) A memo was distributed to all Shift Supervisors, control room operators, and staff personnel on Saturday, March 20, 1971, j reminding them of the specific requirements (as outlined in j Volume A of the Operations Manual) for making allowable changes to the written operating procedures. The memo, which was written in response to a discussion with Mr. Kepler by phone on March 19,: also discussed the im ortance of proper review and j documentation when procedures are c anged.

(b) The Operations Comittee reviewed the existing procedure for i venting the primary containment onpA ril 1,1971 and April 7,1971 9102110377 710505 CF ADOCK 05000263 "i CF

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and approved the issuance of a Volune F Temporary !Aemo which acends the existing procedure. The Volume F remo specifically states that an analysis of the primary containment atmosphere is a basic require-  !

ment for the venting of the contajnnent; however, under the i specifically listed conditions, two senior licensed personnel i may apply the acended procedure for venting the drywell after documenting their decision leading to the application of the l amended procedure.

j Ir addition to the above administrative and procedural actions, coolant injection systems have been installed on the recirculation pump  ;

seals to prevent a seal failure occurrence similar to that which led l to the pressurization of the drywell following the March 10th shutdown, ,

Also, an order has been placed for a radiation monitoring unit to  !

provide continuous particulate, iodine, and gaseous monitoring of the dryuell atmosphere.

2. Pelense of Li mid Radweste Varch 13. 1971 and March 15. 1971  !

The March 13, 1971 and March 15, 1971 li qui d radwaste releases were i ciscussed in a letter sent to Dr. Peter Morris on April 8 1971. The  !

following information is provided in response to item (b),of the l Form AEC-592 attached to your April 21, 1971 letter. j The two liquid discharges, which occurred prior to the completion of the analyses of two independent samples, were released concurrently with other liquid waste batches which had been properly analyzed prior to thei r release. The inadequate implementation of the release procedures  ;

has been corrected by establishing the following procedure for all i liquid radwaste releases to the discharge canal.

(a) Two independent samples are analyzed for each batch of liquid waste which is to be released. The results of the analyses are i included on the Liquid Radwaste Release / Transfer form which is riven to the Shift Supervisor. After reviewing the information, the shift Supervisor signs the form and directs the operator to prepare the radwaste system for the release.

(b) A valve lineup checklist is completed and verified by two operators who initial the valve lineup checklist. The Shift Supervisor is notified that the preparations are complete.

(c) The Shift Supervisor stamps the Liquid Radwaste Release form into the Control Room Log, reviews and enters the pertinent radwaste batch data, and then authorizes the release of the liquid radwaste batch. He signs the log book stamp three times; when he authorizes the release, when the release is initiated, and when the release is completed.

(d) The valve lineup checklist for the radwasie release is reverified at the completion of the release by two operators who again initial

, the valve lineup checklist.

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4 (c) The Liquid Radwaste Felease/ Transfer form and the Valve Lineup Checklist are then returned to the Raciation Protection Engineer for review and proper docucentation.

Should you have any cuestions concerning our activ,,s, please coranunicate di rectly with the plant management.

Yours very trulj, 572Mddo L.J. (lachter Vice President - Power D roduction & System Operation LJ!./CEL/caf

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. .. s NSp ace ='ctorr rii ci-l NORTHERN STATES POWER COMPANY Minneapolis, Minnesota 55401 cp p' -  % '

Ap ril 29,1971 ,D Qi.J.C 0 s N rg Dr. Peter A. licrris, Director

( wn n\?. 1 e%eq , 8 o1 Division of Reactor Licensine C g6e gq '

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United States Atomic Energy Commission I Washington D.C. 20545 g 6 p N

Dear. Dr. Morris:

6 MONT l CELLO NUCLEAf. GENERATITG PLANT Docket No. 50-263 License No. DPF-22 Inoperability of the Air Ejector Off-Gas Sy stem Radiation f/onitors On Ap ril 20, 1971, it was determined that the two air ejector off gas monitors have been inoperable during the startup testing program to the 25%

power level. We are reporting this occurrence in accordanw wi th Section 6.6.B.3 of Appendix A, Technical Specifications, of the Provisional Operating License DPR-22.

Sunrv Des criMion of Occurrence l During the startup testirg program, while initially escalating to each Jpower level, daily Erab samples of the air ejector off-gas are analyzed.

uring the initial rise to 15% power, the air ejector activity discharge was approximately 25 uci/sec with a corresponding stack release rate of approximately 15 uci/sec. These activity rates existed at the time of the 3-10-71 shutdown from 15% power. Following an extended shutdown, the plant was restarted and reached 13% power on 4-19-71 with an air ejector activity discharge of approximatel /

rate of ap 25% power, proximately 45 uci/sec.

On 4-20-71 durinEy the120 ucirisesee initial the analysis of an off-gas grab sample showed the air ejector to with a sta activity discharge to be approximately 300 uci/sec. With this analyzed activity, it was expected that the air ejector off-gas monitors should be 1 l indicating noticeably above the indication provided by the bug sources. While investigating this concern, it was discovered that the monitor indications increased f rom 2.8 mr/hr to approximately 9 mr/hr when the Off-Gas Sample Chamber Purge controls v. are turned to the ON position. It was then recognized that the system was operating normally with the controls indicating a purge condition. The system was operated in this manner l

1 until the plant was shutdown.

Further investigation of the problem revealed that the air ejector sample chamber purge valve was booked up improperly. The valve is a three way valve which should allow purging of the sample chamber when the valve solenoid is energi nd and provide normal sampling when the valve is de-enerEi zed. The valve was found piped up the opposite way and apparently 9 1u'. v9 mopn!4 Ifr-DV

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F ollowing a had been in this condition cince initial installation.

the system was piped up properly and plant shutdown on April 25th,during a plant restart on April 26th, proper verified.

The Region 111 Compliance OfficeTechnical Fcs beenSpeci previously fications. notified of the occurrence in accordance with Section 6.6. A.3 of the Yours veru truly, R.O. Duncanson, Jr., P.E.

Gen. Sept. of Power Plants !!.echanical Chai rman !!.onti cello Safety Audit Committee F0D/CEL/ car I

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