ML20033D230

Notifies That Stack Monitoring Sys Will Be Modified to Accomodate Installation of High Range Noble Gas Effluent Monitor Per Item II.F.1 NUREG-0737 Requirement.Compliance W/Tech Specs During Installation Will Be Maintained

ML20033D230
Person / Time
Site:	Millstone
Issue date:	11/30/1981
From:	Counsil W, Werner R NORTHEAST NUCLEAR ENERGY CO.
To:	Crutchfield D Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.1, TASK-TM B-10339, TAC-45077, NUDOCS 8112070418
Download: ML20033D230 (2)

Text

I

~

.l eral Ifices e folden Street, Berlin, Connecticut -

NW MUMS >

1 l

,= fh NNEC W N t

<L ===; :=

s November 30, 1981

' Docket No. 50-245 8M B10339 C

2S h\\

9 1981*R' r

d Director of Nuclear Reactor itegulation g

DE04 Attn:

Mr. Dennis.M. Crutchfield, Chief g bm.asmucEst WSW p

Operating Reactors Branch #5 U. S. Nuclear Regalatory Commission Washington, D.C.

20555 f

(or g

Gentlemen:

Millstone Nuclear Power Station, Unit No. 1 TMI Action Plan Item II.F.1 High Range Noble Gas Effluent Monitor s

In accordance with Item II.F.1 of NUREG-0737, a high range noble gas effluent monitor is required to be installed by January 1, 1982. To

, allow installation of such a monitor at Millstone Unit No. 1, the con-tinuous stack monitoring system currently in effect must be modified.

Presently,,an isokinetic probe' inserted into the top of the stack di-verts a small percentaee of the total stack exhaust through iodine and particulate filter: >ad two (2) redundant radiation monitors located at the bottom of tb s /,

It is intended that the 1-inch tubing from the nozzle will F~ o '

tuo upstream of the radiation monitors in order to install

-b

'ange nobic gas effluent monitor. Additionally, the 1/2-inch tut ag (

.corcam of the radiation monitors will.also be modified to allov for ndditionsa interconnections.

The Millstone Unit No. 1 Technical Specification 3.8.A.1 and Environ-mental Technica) Specification 2.4.2.2.H require that the gross activity of the gaseous wastes released from the stack be continuously monitored and recorded.

To allow continued cc pliance with these specifications, c

, Northeast Nuclear Energy Company (NNECUy intends to utilize flexible plastic tubing to bypass sections of the installed 1-inch stainless steel tubing upstream of the radiation monitors and the 1/2-inch

~

tubing devnstream of the radiation monitors. During the very small interval of time between the cutting of the installed tubing and the attachment of the flexible tubing, the stack exhaust will not be mon-itored. Also, upon completion of the modifications to the current monitoring system, stack releases will not be monitored while the flexible tubing is. disconnected. However, NNECO has concloded that the t'ntent of Technical Specification 3.8.A.1 and Environmental Technical Specification 2.4.2.2.H will still be met.

{ okkh 6 0112070418 811130 PDR ADOCK 05000245 g

P PDR b

r 4

,

• It is 'ated that monitoring is normally interrupted for short periods of time iuring the routine changing of the iodine and particulate filters.

-Preparations necessary prior to tapping into the present monitoring system are scheduled to be completed by November 30, 1981. NNECO will attempt to install the high range noble gas effluent monitor during any unplanned shutdown of sufficient duration between ap-proximately November 30, 1981 and the time by which we must install t-

. these n.onitors during normal plant operation to assure completion of, this project, including appropriate testing by January 1, 1982.

Ever if the modificatione are performed during a plant shutdown, the tech 11 cal specifications will still need to be met and the above-mentioned tamporary piping hook-up will still be required.

The purpose of this letter is to inform the NRC Staff of the method by which we will remain in compliance with the technical specifications during installation of the high range noble g?.s effluent monitor.

l-No action by the NRC Staff is being requested by this submittal.

l l

Should you have any questions, please feel free to contact me.

I-Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY e

l-

.h l

'll. G. Co%sil l

Senior Vide President

/

w I

'By:

R. T. Werner l

Vice. President Generation i

Engineering and Construction l-l

!~

l 4

L

+