ML17037B622

Letter Providing Additional Information Relating to Fuel Loading Sequence and Verification Techniques and Completing Response to the 03/03/1977 Request

ML17037B622
Person / Time
Site:	Nine Mile Point
Issue date:	06/30/1977
From:	Rhode G Niagara Mohawk Power Corp
To:	Lear G Office of Nuclear Reactor Regulation
References
Download: ML17037B622 (8)

Text

U.S. NUCLEAR REGULATORY COMMISSION DOCKET NUMBER IVRC,FORM,19/

(2-76), -'

NRC DISTRiBUTION ~osRT 50 DOCKET MATERIAL Vj is~

~ FILE NUMBER FROM: NIAGARA MOHAWK POWER CORP DATE OF DOCUMENT TO'" G. LEAR SYRACUSE, N.Y. 6 30 77 G.K, RHODE DATE RECEIVED 7 5 77 0 NOTO R IZ E D PROP INPUT FORM NUMBER OF COPIES RECEIVED ETTE R QCOPY RIGINAL PIC LASS F E D I I sic ~RA DESCRIPTION ENCLOSURE RESPONSE TO NRC'S 3/3/77 REQUEST;FOR~ADDITI 'AL INFO RELATED TO FUEL LOADING SEQUENCEj'AND~

VERIFICATION TECHNIQUES PRIOR TO STAR]'UP.

(2P 6 1P)

PL'ANT NAME: NINE MILE PT 8 .1 l)tl Ml Ri,Ã SAB FOR ACTION/INFORMATION ENVIRHNMENTAL ASSIGNED AD: Vo MOORE LTR BRANCH CHIEF:

JECT MANAGER: PROJECT MANAGER:

CENSIiVG ASS3) STANT: LICENSING ASSISTANT:

Bo HARLESS INTERNAL 0 ISTRI BUTION STFMS SAFETY PLANT SYSTEMS SITE SAFETY &

HEINEMAN TEDESCO ENVIRON ANALYSIS ROEDER BENAROYA DENTON & MULLER ENGINEERING IPPOLITO ENVIRO TECH ERNST EIt)+ OPERATING REACTORS BALLARD UNG BLOOD BAER VAK BUTLER GAMMILL 2 Z CZY RIME CHECK SITE ANALYSIS VOLLMER AT&I BUNCH ALTZMAN J ~ COLLINS BERG KREGER E TERNAL OISTRIBUTION CONTROL NUMBER TIC NSIC 771870055 G IV J HAiICHETT 16 CYS ACRS SENT CAT GO

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NIAGARA MOHAWK POWER CORPORATION NIAGARA 300

~ MOHAWK ERIE BOUI.EVARD WEST SYRACUSE, N.Y. I 3202 GERAI.D K. RHODE VICE PRESIDENT June 30, 1977 Director of Nuclear Reactor Regulation ATTN: Mr. George Lear, Chief Branch 83 U. S. Nuclear Regulatory Commission ~agalataTpy.~ Fife'y Washington, DC 20555 RE: Nine Mile Point Unit 1 Docket No. 50-220

Dear Mr. Lear:

In response 7 of our March 14, 1977 letter, it was stated that Niagara Mohawk would provide additional information related to fuel loading sequence and verification techniques prior to startup. This letter provides this additional information and completes our response to your original request dated March 3, 1977.

The fuel loading placement for Cycle 5 is identical to that provided in NEDO 21466. The fuel loading and shuffling sequence for Cycle 5 is generated by a computer code. Utilizing the end of Cycle 4 and beginning of Cycle 5 core configurations, the code generates the allowable loading sequence. A sample of the generated loading sequence is shown on Figure

1. To reduce the probability of misloading a fuel bundle, in most cases no more than one fuel assembly is removed from a quadrant at any one time.

Proper rotational orientation of fuel assemblies in the reactor core is readily checked by visual observation and assured by verification procedures during core loading. Five separate visual indications of proper fuel assembly rotational orientation exist:')

The channel fastener assemblies, including the spring and guard used to maintain clearances between channels, are located at one corner of each fuel assembly adjacent to the center of the

,control rod.

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2) The identification boss on the fuel assembly handle points toward the adjacent control rod.

3) The channel spacing buttons are adjacent to the control rod passage area.

4) The assembly identification numbers which are located on the fuel assembly handles are all readable from the direction of the center of the cell.

5) There is cell-to-cell replication.

A Core Loading Verification Procedure is used to verify that the core is properly loaded and that the fuel loading plan agrees with the core loading. An underwater TV system is used to videotape the as loaded core and the tape is independently reviewed to assure proper loading. The videotape of thy core verification process is filed in permanent records for retention.

The use of the fuel shuffling code, visual observations, and verification procedures assures the proper placement and orientation of the fuel assemblies in the reactor core.

Sincerely, NIAGARA MOHAWK POWER CORPORATION aid . hode Vice President, gineering SWW:nld

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