ML20148J673
| ML20148J673 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 09/22/1975 |
| From: | Vandenburgh D YANKEE ATOMIC ELECTRIC CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| WYR-75-107, NUDOCS 8011250253 | |
| Download: ML20148J673 (6) | |
Text
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.g Proposed Change No. 133
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- Telephone 617 366-9011
~ 1 710-390 0739 YANKEE ATOMIO ELECTRIC COMPANY pyw -
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. 'YANKEE
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September 22, 197' 5 .,
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License No. DPR-3 (Docket cA 50-29) ,, A - ,' \r/
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Dear Sir:
( q -_ p. Pursuant to Section 50.59 of the Commission's Regulations, Yankee Atcmic Electric Company hereby requests to make the following changes: PROPOSED CHAMOE: Reference is made to Section 107 of the Final Hazards Summary Report. We propose the following:
" Plug two leaking flux detector paths using commercial tube plugs. The plugs will be installed at the threaded tubing connection at the reactor vessel head."
REASON FOR CHAMGE: During the first cycle of operation of the new in-core instrumentation system leaks developed in two flux detector paths. The leaks were isolated by closing the isolation valves in the paths. The proposed plugging technique will minimize the length of pressurized tubing. This technique was provided for in the original design of the in-core system in case the need for plugging ever arose. DESCRIPTION CF CHANGE: The plug will consist of a Swagelok type blind plug. It will be installed at the tubing joint that was provided for disconnecting the interconnecting tubing that runs from the isolation valves to the reactor vessel. The plug is a standard commercial compenent and will be rated at the same pressure and temperature conditions as the ccher tubing fittings. FIMAL HAZARDS SU!&.ARY REPORT (FHSR) . The existing description of the in-core instrumentation system is modified as indicated. Replacement FHSR pages are previded: Section 107:3, paragraph 2, add a new last sentence:
"Two of the flux detector thimbles have been plugged due to leakt.'
I g THIS DOCUMENT CONJAINS POOR QUA6TY PAGES B 01125 0 W
. G G United States Nuclear Regulatory Commission September 22, 1975 httnf Office of Nuclear Reactor Regulation Page Two l Section 107:5: i Show typical plugged path.
Section 107:9: Delete core positions H-2 and K-6 as instrumented locations. l Sectio:. 107 :10: Delete raths B2 and B3; add Note 4 which states," Paths B2 and B3 are not in service due to tubing leaks." SAFETY CONSIDEFATIONS,: The plant has operated in excess of eight months with no detrimental effect caused by the loss of these two paths. The distribt tien of instrumented core positions is such that, using quarter core symmetry, a full flux map can still be obtained. The plug is a standard Swagelok fitting and is rated for service conditions in excess of primary plant design conditions. Based on these factors, it is concluded that there is reasonable assurance that operation of the Yankee Naclear Power Station with flux detector thimbles plugged as described herein will not endanger the health and safety of the public. This proposed change has been reviewed by the Nuclear Safety Audit and Review Ccmmittee. SCHEDJLE OF CEANGE: The plugs will be installed during the core XI-Core XII refueling outage, which is scheduled to commence on October 18, 1975. We trust the information provided is adequate. If additional data is required, please feel free to contact us. Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY D. E. Vandenburgh Vice President l CCE ONWEALTH CF MASSACHUSETTS)
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COUhiY OF WOECESTER ) Then perscnally appeared before me, D. E. Vandenburgh, who being duly sworn, did state that he is Vice President of Yankee Atomic Electric Corapany, that he is duly authorized to execute and file the foregoing request in the name and on behalf of Yankee Atomic Electric Company and that the statements therein are true to the best of his knowledge and belief.
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j/'//744.S W & :{ / I e, Armand R. Soucy Notary Public My Commission Expires September 9, 1977 l l l
i . O C 107:3 i Draft ! l l Support Structure The in-core instrumentation (thermocouples and flux detector paths) are positioned and supported in the reactor by the in-core instrumentation support structure, which is shown on page 107:4. The support structure consists of three frames, a' support plate, four guide columns, two thermocouple columns, two flux columns, twenty-two flux detector thimbles and twenty-six thermocouple thimbles. Two of the flux detector thimbles have been plugged due to leaks. Each of the three frames is constructed of flat stainless steel plate welded together to form a lattice. The control rod guide tubes occupy the open regions of each lattice. The support plate'has similar holes for the guide tubes. The two flux thimble columns and two thernccouple columns exit the reactor through the instrument port penetrations in the reactor vessel head. These penetrations are located above four of the eight fixed shim rods. A cross sectional view of the incore instrumentation is shown on page 107:4. In order that the upper core support barrel can be removed and stored for' refueling it is necessary that the flux thimbles be removed from the core. This is accomplished by the telescoping guide columns. The guide columns consist of an outer column, which supports the niddle frame, upper frame and support plate, and an inner column, which is connected to the lower frame. At refueling, the movable frames and plate are pulled upwards, which renoves the thimbles from the core. The structure is'then~ locked in this position. A cutaway view of the reacter vessel shouing the new incore instrumentation equipment is shown on page 107:4. A general view of the conoseal arrangement for the four seal assemblies is shoun on , page 107:5. Four seal assemblies are provided for the four instrument ports in the head. The thermocouple column port seal is shown on page 107:6 and the flux column port seal is shown on page 107:7. 1 1
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'l gj NR dlSTRIBUTION FOR PART 50 DOCITf MATERIAL h !
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j CONTROL NO:10129 t FILE: FROM: 'lankee Atomic Electric CoDATE OF DOC ' DATE REC'D LTR TWX RPT OTHER 8 basefarE"2-$' 9-22-75 9-2h-75 xxx ORIG CC OTHER SENT NRC PDR XXX TO: 3 Sirned 39 SENT LOCAL PDR YYY ITRC ' CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO: Xu 42 50-29 DESCRIPTION: Letter notarized 942-75..... ENCLOSURES: 10tter nequesting Proposed Change F33 to Tech. Revised pages to Tech. Spec # 33. . . . . . Specs.toOLMP3-33 Concerning FHSR and
- Lienese.....
(42 Copies Enclosure Received) Letter trans the following...... .. 4 PLANT NAME: fankee Rove 4 s FOR ACTION /INFORMATION SAP 4.99 79 BUTLER (L) SCHWENCER (L) ZIEMANN (L) W/ Copies W/ Copies W/ Copies REGAN W/ Copies(E) ACKNOWLEDGED CLARK (L) STOLZ (L) DICKER (E) LE AR (L) I W/ Copies W/ Copies W/ Copies W/ Copies PAR R (L) VASS ALLO (L) KNIGHTON W/ Copies (E) SPIES W/ Copies
-DO NOT REMOVE W/ Copies W/ Copies KN!EL (L) / PURPLE (L) YOUNGBLOOD (E) LPH W/ Copies W/gCopies W/ Copies W/ Copies INTERNAL DISTRIBUTION rF'c TECH REVIEW DENTON LIC ASST ' A/T IND .
RC POR SCHROEDER GRIMES R. OlGGS (L) BRAITMAN AGC, ROOM P 506A MACCARY GAMMILL H. GE ARIN (L) SALTZMAN KNIGHT KASTNER E. GOU LBOURNE (L) MELTZ faOSSICK/STAF F BALLARD CASE PAWLICKl P. KREUTZER (E) GIAMBUSSO SHAO SPANG LE R J. LEE (L) PLANS BOYD STELLO M. RU33 BROOK (L) MCDONALD MOORE (L) HOUSTON ENVIRO S. REED (E) CHAPMAN DEYOUNG (L) NOVAK MULLER M. SERVICE (L) DUBE (Ltr) ROSS DICKER E. COUPE SKOVHOLT (L) _ /S. SHEPPARD (L) PETERSON GOLLER (L) (Ltr) IPPOLITO KNIGHTON M. SLATER (E) P. CO LLINS TEDESCO YOUNGBLOOD H. SMITH (L) HARTFIELD (2) DENISE J. COLLINS REGAN S. TEETS (L) KLECKER LAINAS / PROJECT LDR G. WILLI AMS (E) EISENHUT REG OPR_ BENAROYA y Au V. WILSONlt) WIGGINTON flLE & REGION (2) R, INGRAM (L) A* MIPC VOLLMER H AR LESS M. DUNCAN (E) EXTERN AL DISTRIBUTION
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