ML18219C241

07/06/1977 Letter Occurrence of Routine Release of Radioactive Gas from the Waste Gas Holdup Tanks Without Having Automatic Closure for the Gas Discharge Valve

ML18219C241
Person / Time
Site:	Cook
Issue date:	07/06/1977
From:	Shaller D American Electric Power Service Corp, Indiana Michigan Power Co, (Formerly Indiana & Michigan Power Co)
To:	James Keppler NRC/IE, NRC/RGN-III
References
LER 1977-003-00
Download: ML18219C241 (6)

Text

U.S. NUCLEAR REGUI.ATORY COM ION DOCKE NUMBE NRC'FORM 195 (2 76I FILE NUMBER NRC DISTRIBUTION FoR PART 50 DOCKET MATERIAL FROM: DATE OF DOCUMENT TO:

Indiana & Michigan Pwr. Company 7/6/77 Mr J. G. Keppler Bridgman, Michigan DATE RECEIVED D V. Shaller 7/19/77 QNOTORIZED PROP INPUT FORM NUMBER OF CPPIES RECEIVED E ER RIG INAL COPY NCLASSIF IED / signecf DESCRIPTION ENCLOSURE Consists of information regarding their 6/30/77 Licensee Event Report (RO 50-315/

77-03) concerning their eeking a routine ,Q release of radioactive gas from the waste gas >01 RZM0yg holdup tanks .without having automatic closure for the gas discharge valve ~ ~ ~ ~ ~ ~ ~ ~

PLANT NAME:

gJh ~E~OWLEDGEB>-P)

NOTE: IF PERSONNEL EXPOSURE IS INVOLVED SEND DIRECTLY TO KREGER/J. COLLINS FOR ACTION/INFORMATION INTERNALD IST RI BUTION EXTERNAL DISTRIBUTION CONTROL NUMBER

~ e ACRS 16 SENT AS AT B 772000231 NRC FORM 196 (2-76)

/

g l

C

%4 ir

'I I t i I,

ND NA & NICHIGANPDNER CONPANY DONALD C. COOK NUCLEAR PLANT P.O. Box 458, Bridgman, Michigan 49106 July 6, 1977

~o Mr. J.G. Keppler, Regional f~

Director Office of Inspection and Enforcement United States Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen El lyn, IL 60137 Operating License DPR-58 Docket No. 50-315 AEO 50-315/77-03

Dear Mr. Keppler:

On June 30, 1977, we reported to you an event which occurred at the D. C. Cook Nuclear Plant Unit 1 on that date. In that report we stated that we had made a routine release of radioactive gas from the waste gas holdup tanks without having automatic closure for the gas discharge valve in violation of Appendix "B" Technical Specifications Section 2.4.3.d.

The waste gas holdup tank had been properly sampled and approved for release. The vent stack radiation monitors were operating during the release.

This event occurred as a result of a procedural error. The automatic trip function for the waste gas discharge valve RRV-306 had been shifted from R-21 to R-26 when design change RFC DC-12-1384 was implemented. Operating Procedure OHP 4021.023.002 Release of Radioactive Gaseous Waste From Gas Decay Tanks, was revised when the RFC was implemented and the error occurred when the requirement to check R-25 was not included. The pump which supplies R-25 and R-26 must be operable for these radiation monitors to properly monitor the gas release and provide the trip function.

The pump and paper drive for R-25 and R-26 had been disabled to perform repairs.

This RFC eliminated the need to use R-25 as a particulate monitor.

OHP 4021.023.002 Release of Radioactive Gaseous Waste From Gas Decay Tanks, was revised when the RFC was implemented but we failed to include in the revision the requirement to check R-25 to make sure the sample pump is running. The sample pump also supplies R-26.

I 77200023i JUL 8 197T

0 r-l lt'it

~'"I p fqII ]4

(

$ %4Pw Mr., J.G. Keppler July 6, 1977 Page 2 of 2 n

I W

To prevent recurrence of this event, a temporary change was written to OHP 4021.023.002 to include the requirement for checking R-25 to assure the sample pump is operat~ ing pVioj't/to starting a gas release.

There was no hazard to the health and safety of the public as a result of this event.

Sincerely, D.V. Shaller Plant Manager

/bab cc: R.S. Hunter J.E. Dolan G.E. Lien R. Kilburn R.J. Vollen BPI K.R. Baker RO: III R.C. Callen MPSC P.W. Steketee, Esq.

R. Walsh, Esq.

G. Charnoff, Esq.

G. Olson PNSRC J.F. Stietzel J.M. Hennigan Dir., IE (20 copies)

Dir., MIPC (2 copies)

Directorate of Licensing

RECEtVED OOCUgENP PROCESSING Ugr 190 JUL f8 pM tp pg