ML19259D112
| ML19259D112 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 07/30/1979 |
| From: | Moody D YANKEE ATOMIC ELECTRIC CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| RO-50-29-79-18, NUDOCS 7909100112 | |
| Download: ML19259D112 (2) | |
Text
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en7 346-9011 ree YANKEE ATOMIC ELECTRIC COMPANY s
20 Turrspoke Road Westborough. Massot.husetts 01.381
%xmn July 30, 1979 Mr. 5. H. Crior Director U. S. Nuclear Hagulatory Consaission Of fice of Inspect. ion and Enforceament Region 1 631 Park Avenue Xiag of.Pruem14, PA 19406 Subjects Licensas Event Report 50-29/79-18 P-=
Fuel Wad Pre-t'raseucization Error Desc He. Criers Pursuant to the requirevients of Technical Specification Section 6.9.4.a. (8) the following is x perzed am Reportable occurrence 59-29/79-18.
The occurrence involves "erroca discovered in the traumient or accident analysis or in che methods used for such an=1ysis as described in the MISR oc in the Bases for the Tech-alcal Specifications that have oc could have pen rred cemetac
,eperation in a manner less consarvative.than ammuned in the.ana-lysie."
YanW Atamic Electric Company was infor:med about a deviation in the fuel pin preamuse trona its specirted value by its fumi amanutmecure r.
Ezzon Nuclear, Inc.
The nominal value of the pin prannoce is 1251 5 peig, -huc a refined ammsuremenc oc the archieved pins abowed a preeauce of up to a ~i-value of 143.1 pois.
'Ih= pin pseanute impacts LOCI calcuir.tions in two wayuz (1) thu average fuel r==p-erature at egercating conditions may change and (2) the -11 ing and rupture response during the accident my alter.
To masene the impact, CaPCD:(-THERMAL-2 computer calculation was per-formed for che high (as-built) mand leu (design) prep-ressuricacica levels.
It da pe>edicted that at the present operating core aveerage buruup condition of 6867 WD/Mr. the as-built fuel average M P r_
ture is about 73 F (3.1%) lower than that of the design case ad the pressure ia about 1.7 pai or 0.2% highet.
It in also predicted that at the end-of-cycle conditions, the mm-built fuel ave.rmge temperature is about 111 F (-6.1%) lower than th.er of the desigu came and the presuure la about 74 pai or -6.6% lower.
Wace, it is concluded that the pin pressure increase tram ira specified value of 1251
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.s, Licanase Evenc Report 50-29/79-18 Ruwan Fual 1 Lad f re-Preewarization Error Fase two 5 pais shasuld have no adverse affect on.Pemi Clad Tanparacuee experienced as a resulc of a LOCA and that the plant may concinue to operate withouc adverasely impacting the health and ausfacy of the pubile.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPAMT D
D.
E., N ody Manager of Operacions JKT/sec cc:
Direct.ot, Office of Inspectiett and Enforcecnenc U.
S., Nuclear Wmgulatory Commimmion Washington, n. C.
20555 Dicdctor Office of Manstement Information & Programa Cancsv1 U. S. helear Regulatory Commalmeion Washington, D. C. 20DS r\\P
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