ML18038A133

Forwards Addl Info Re Compliance to Reg Guide 1.97,per 860213 & 21 Telcons.Info Should Close Confirmatory Item 10. Developments in Nuclear Industry Re Neutron Flux Monitoring Instrumentation Will Continue

ML18038A133
Person / Time
Site:	Nine Mile Point
Issue date:	03/03/1986
From:	Mangan C NIAGARA MOHAWK POWER CORP.
To:	Adensam E Office of Nuclear Reactor Regulation
References
CON-IIT07-464A-91, CON-IIT07-464B-91, CON-IIT7-464-91A, CON-IIT7-464A-91, CON-IIT7-464B-91, RTR-REGGD-01.097, RTR-REGGD-1.097 (NMP2L-0644), (NMP2L-644), NUREG-1455, NUDOCS 8603070317
Download: ML18038A133 (8)

Text

1 4

REGULA INFORMATION DISTRIHUTI TEM (RIDS) ~

I ACCESSION NBR: 8603070317 DOC. DATE: 86/03/03 NOTARIZED: YES DOCKET 0 FACIL: 50-410 Nine Mile Point Nuclear Stati one Unit 2i Niagara Moha 050004'10 AUTH. NAME AUTHOR AFFILIATION MANGAN, C. V. Niagara. Mohawk Power Corp.

RECIP. NAME RECIPIENT AFFILIATION ADENSAMi E. G. BNR ProJect Directorate 3

SUBJECT:

Forwards addi info re compliance to Reg Guide 1. 97'er 860213 5 21 telcons. Info shold close confirmatory Item 10.

Devel opments in nuclear industry re neutron flux monitoring instrumentation will continue.

DISTRIBUTION CODE: H001D COPIES RECEIVED: LTR ENCL SIZE:

TITLE: Licensing Submittal: PSAR/FSAR Amdts Zc Related Correspondence NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL BWR ADTS 1 1 BWR PD3 PD 1 1 BWR EB, 1 1 BWR EICSB 1 1 BWR FOH 1 1 BNR PD3 LA 1 1 HAUGHEYz M 01 2 2 BNR PSB 1 1 BNR RSH 1 1 INTERNAL: ACRS 41 6 6 ADM/LFMB 1 0 ELD/HDS3 1 0 IE FILE 1 1 IE/DEPER/EPB 36 1 1 IE/DGAVT/GAB 21 1 NRR BNR ADTS 1 0 NRR PNR-* ADTS 0 NRR PNR-H ADTS 1 0 NRR ROE> M. L 1 1 NRR /HFIH 1 1 NRR/DHFT/MTH 1 1 G 04 1 1 RGN1 3 3 DAMI/MIB 1 0 EXTERNAL: 24X 1 1 BNL(AMDTS'NLY) 1 1 DMB/DSS (AMDTS) 1. LPDR 03 1 1 NRC PDR 02 1 1 NSIC 05 1 PNL GRUEL' 1 1 TOTAL NUMBER OF COPIES REGUIRED: LTTR 39 ENCL 33

8' h

1 h

II n, It WE t W

~

C'

NIAGARA MOHAWK POWER CORPORATION/300 ERIE BOULEVARD WEST, SYRACUSE, N,Y, 13202/TELEPHONE (315) 474-1511 March 3, 1986 (NMP2L 0644)

Ms. Elinor G. Adensam, Director BWR Project Directorate No. 3 U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Washington, DC 20555

Dear Ms. Adensam:

Re: Nine Mile Point Unit 2

-Docket.No: 50-410 ..

Attached is additional information concerning the Nine Mile Point Unit 2 compliance to Regulatory Guide 1.97. This response is in addition to the response provided on January 20, 1986.

This material was discussed in telephone conversations with your staff on February 13, 1986 and February 21, 1986. Niagar a Mohawk expects that this material provides the necessary information to close Confirmatory Item 10.

Very truly yours, C. V. Mangan Senior Vice President TL:ja 1361G Attachment xc: R. A. Gramm, NRC Resident Inspector Project File (2) 8603070317., 860303

~DOCK 0S000yg0>., ~

.. pea',

D

~,

I

~ ~

t ~ ~

UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of Niagara Mohawk Power Corporation ) Docket No. 50-410 (Nine. Mile Point Unit 2) )

AFFIDAVIT C. V. Man an , being duly sworn, states that he is Senior Vice President of Niagara Mohawk Power Corporation; that he is authorized on the part of said Corporation to sign and file with the Nuclear Regulatory Commission the documents attached hereto; and that all such documents are true and correct to the best of his knowledge, information and belief.

Subscribed and swor to before Notary Public in for State of York and County of me, a

, this~ day of d he New 1986.

ot rry Public in and for County, New York My Commission expires:

'JANIS M. MACRO Notary Public In tho State ol New York Qualitied In onondege county No. 4784555 My Cornrnisslon f.xpiros March 30. 19 gf.,

I 1>>

I f

Attachment 2 . Neutron flux - The applicant should provide Class lE power sour ces for this instrumentation; the applicant should show that the source and intermediate ranges have sufficient overlap.

~Res onse In addition to the information provided, in our January 20, 1986 letter, Niagara Mohawk will continue to follow and evaluate developments in the nuclear industry concerning neutron flux monitoring instrumentation.

Prior to the conclusion of the first refueling outage, Niagara Mohawk will update and identify to the Nuclear Regulatory Commission the status of the neutron flux monitoring instrumentation issue for Nine Mile Point Unit 2.

4. Coolant level in reactor - The applicant should identify the remainder of this instrumentation in accordance with Section 6.2 of NUREG-0737, Supplement No. 1, identify any deviations, and justify those deviations identified.

~Res onse As stated in our January 20, 1986 letter, conformance to Regulatory Guide 1.97, Revision 3 is accomplished by the use of two transmitters per division, one fuel zone and one wide r ange. As noted in Section 3.3 .3 of your November 15, 1985 letter, the wide range transmitters were omitted from Table 421.36-1 and will be added in the next Final Safety Analysis Report amendment.

The wide range transmitters (2ISC~LT9C and D) are calibrated to monitor the 375.70 in. level, which is inside the fuel zone transmitter range, to the 585.70 in. level which is 62.3 in. below the centerline of the main steam lines at 648 in. It should be noted that all safety trips from reactor level occur within these level ranges.

This range meets the intent of the regulatory guide which is to restore and maintain reactor pressure vessel water level to ensure adequate core cooling.

Water level indication is available in the control room to the operator from one transmitter (2ISC*LT105) covering the 525.70 to 925.70 in. level which is well above the main steam lines. A second transmitter (2ISCWDT110) covering the 525.70 to 705.70 in. level is also available to the control room operator on a strip chart recorder. However, neither of these transmitters (2ISCWDT110 and LT105) fully meet the qualification requirements of Regulatory Guide 1.97.

l ) 9.wh"",w 'I s w W ffh 1 t,) ff a" I w

.I

~ r II

'I I

I I'l e I w

h Ir h h, 1

hW hl hl

~ ~

I w ~ I h '

II I Il .'5 II 'I N

'" l y

w

~

wl

~ f' r