L-77-241, Letter the Eleven Steam Generator Tube Plugs Discovered to Be Missing During Recent Steam Generator Inspections

Letter the Eleven Steam Generator Tube Plugs Discovered to Be Missing During Recent Steam Generator Inspections

ML18227D832
Person / Time
Site:	Turkey Point
Issue date:	07/29/1977
From:	Robert E. Uhrig Florida Power & Light Co
To:	Stello V Office of Nuclear Reactor Regulation
References
L-77-241
Download: ML18227D832 (9)

Text

P" U.S. NUCLEAR REGULATORY Co MISSION DOCKET NUMBER IfORC FORM 195 II2~7S I I

FILE NUMBER

" NRC DISTRIBOTION FDR PART 50 DOCKET MATERIAL FROM: DATE OF DOCUMENT TO:

Florida Power & Light Company 7/29/77 Mr. Victor Stello Miami, Florida DATE RECEIVED R bert ED Uhri 8/1/77 LETTER PNOTO R IZE D PROP INPUT FORM NUMBER OF COPIES RECEIVED IEIOR IGINAL RUNG LASS I F I E D OCOPY DESCRIPTION ENCLOSURE License No DPR>>41 Appl for Amend: tech specs proposed change augmenting applicant's 7/6/77 ltri dealing with the steam generators.. .notorized 7/29/77 ' ~

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PL'ANT NAME: Turkey Point Unit No. 4 R JL 8/ 2/77 ~

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FOR ACTION/INFORMATION ENVIRHNMENTAL ASSIGNED AD: Vo MOORE LTR BRANCH CHIEF:

EC MANAGER: PROJECT MANAGER:

EN ING ASSXSTKIT: LICENSING ASSISTANT:

B~ HARLESS INTERNAL DISTRIBUTION 7FMS SAFETY PLANT SYSTEMS SITE SAFETY &

HEINEMAN TEDESCO ENVIRON ANALYSIS BENAROYA DENTON & MULLER ENGINEERING IPPOLITO ENVIRO TECH OPERA ING REACTORS BALLARD B OD BAER B ER GAKGLL 2 G ME CHECK SITE ANALYSIS VOLLMER AT I BUNCH ALTZMAN J COLLINS E G KREGER EXTERNAL DISTRIBUTION CONTROL NUMBER TIC NSIC 772140Z70 REG IV J HANCHETT 16 CYS ACRS SENT CAT NRC FORM IQS (2 78)

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P. O. BOX 013100, MIAMI, FL 33101 yklllyg FLORIDA PGWER & LIGHT COMPANY L-77-241 July 29, 1977 Mr. Victor Stello, Director Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington DC 20555

Dear Mr. Stello:

Re: Turkey Point Unit 4 Docket No. 50-251 Proposed Amendment to Facility Operating License DPR-41 This letter augments Florida Power 6 Light's letter of July 6, 1977, (L-77-208) which requested a license amendment authorizing operation of the facility for six months at, which time the steam generators would be reinspected, and also supplements the infor-mation forwarded to Mr. George Lear of your staff on July 27, 1977, (L-77-240) regarding the eleven steam generator tube plugs which were discovered to be missing during recent steam generator inspections.

The Company Nuclear Review Board and the Plant Nuclear Safety Committee have reviewed the incidents as described in our letter of July 27, 1977, (L-77-240) and have come to the following conclusions:

1. No loose objects were present in th'e reactor vessel immediately following the inspection.

2. The possibility exists that the presence of a single plug may have been missed during the inspection of the Reactor Coolant System for missing plugs, but the probability of eleven plugs being missed by the inspection is extremely small.

3. The .eleven missing plugs were most likely never originally installed.

4. A single object entered the reactor vessel following the inspections.

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L-77-241 0

June 29, 1977 Mr. Victor Stello page 2

5. The object is metalic with a mass of between O.l 1.0 pound.

6. The object is now dormant in the reactor vessel, most likely at rest in a low flow area, within the bottom of the reactor vessel.

7. The operation of the unit with an object as described above in the reactor vessel has been thoroughly evaluated and it it has been concluded that will not, result in any adverse structural effects on the reactor vessel its cladding, or reactor internals. It has also been concluded that no adverse thermalhydraulic or other core conditions will result from the operation of the unit.

As a result of the foregoing conclusions, the Plant Nuclear Safety Committee and Company Nuclear Review Board have determined that the return of Unit 4 to full power operation 1) will not in-crease the probability or the consequences of any accident pre-viously analyzed in the FSAR, 2) does not create the possibility of an accident not analyzed in the FSAR, and, 3) does not decrease the margin of safety as described in the basis of the facility Technical Specifications. The PNSC and CNRB have therefore also concluded that the return of unit 4 to full power operation will not involve an unreviewed safety question and will not, adversely effect the health and safety of the public.

Moreover, to provide additional assurance that the unit is operating as expected upon return to power the following actions will be taken:

1) Low, intermediate, and high power physics" maps will be taken and submitted to the NRC within thirty days after reaching full power operations.

2) The use of the metal impact monitoring system (MIMS) with the capability,,of'detecting loose objects will be continued at least until the next reactor vessel inspection.

In the event that the MIMS is out of service, be reported to the NRC. Every effort will be made it will to restore the system to operation as soon as possible.

3) Any abnormal indications from the MIMS will be reported to'he NRC.

L-77-241 June 29, l977 Mr. Victor Stello page 3

4) Within seven days of noting any abnormal indications, a written evaluation will be sent to the NRC.

5) Photographs of the steam generator tube sheets following the Spry.ng 1977 steam generator inspections will be sent to the NRC.

6) Following each startup from below 350'F core barrel movement will be evaluated using neutron noise techniques.

7) During the next major refueling, the reactor vessel will be inspected for loose parts and results reported to the NRC.

Very truly yours, Robert E. Uhrig Vice President REU:GDW:tm cc: Robert Lowenstein, Esquire Normal C. Moseley, Region II

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Robert E. Uhrig, being first duly sworn, deposes and says:

That he is a Vice President of Florida Power 6 Light Company, the Licensee herein; That he has executed the foregoing document; that, the state-ments made in this said document are true and correct. to the best of his knowledge, in formation, and belie f, and that he is authorized to execute the document on behalf of said Licensee.

Robert E. Uhrig Subscribed and sworn to before me this aay ot , 5.9~7 NOTARY P BLIC, in and fr th County of a e, State o Florida NOTARY PUBLlC STATE OF FLORIDA IIt lARGE tIY COMMISSION EXPIRES fAAY 6, 5935 My commission expires: GONDED THRLI MAYIIARD QONDING AGENCY

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