ML20207G408
| ML20207G408 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/02/1977 |
| From: | Klingler G, Nolan F, Sniezek J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-77-216, NUDOCS 9903120068 | |
| Download: ML20207G408 (1) | |
Text
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gp gcg Decembcr 2, 1977 V
PRELIMIflARY Hu IFICATION OF EVENT OR UNUSUAL
$UIENbE-216 This preliminary notification constitutes EARLY notice of an event of 70f!IfBCE safety or publTc interest significance.
The inf ormation presented is as initially received without verification or evaluation and is basically all that is known by IE staff on this date.
Facility:
Northcast Nuclear Energy Company Millstone Point, Unit 2 Waterford, Connecticut (DN50-336)
Subject:
CRACKS IN STEAM GENERATOR UPPER TUBE SUPPORT PLATE On December 1,.1977 with the plant in a refueling outage, crack,1 were found in the upper tube support plate of each steam generafor. '8The cracks were discovered when a section of.this plate was being removed i
for examination'related to the tube denting problem which is being ex-perienced in steam generators.
Only a s' mall area of the upper tube support plate of each steam generator has been examined to date, since access was made through a small hand hole port.
In addition to the steam generator tubes, this. plate has. holes to permit water and steam flow.
Cracks were identified between tube holes anc' also between tube and flow holes.
The licensee is formulating plans for further examinations of othe areas of the upper tube support plate and also the tube support plate 1:sediately i
below the upper one. The remaining tube supports in,each steam gener-ators are an " egg crate" type design which would not have this type of i
s cracking.
a Media interest is expected because of past/ current problems with steam generators and attention being directed to these problems. The State of i
Connecticut has been informed. A press release is not planned by the licensee or NRC.
NRC, Region I (Philadelphia) received notification of this occurrence by telephone from the Plant Superintendent at 4:10 PM, December 1, 1977.
An NRC Inspector.on site obtained further information and is following the problem. This information is current as of 11:15 AM, December 2, 1977.
Contact:
GKlingler, IE x28019 FNolan, IE x28019 JSniezek, IE x28019 Distribution:
Transmitted H St U ol g
Chaiman Hendrie Commissioner Bradford h
Commissioner Kennedy S. J. Chilk, SECY C. C. Kammerer, CA O Commissioner Gilinsky (ForDistribution)
Transmitted: MNBB th Od P Bldg' 8/,' 0 4 E. Volgenau, IE L. V. Gossick, EDO E. G. Case, NRR Region % Q Q S. H. Hanauer, ED0 J. J. Fouchard, PA SS' Bldg @ 0 7
'(MAIL)
R. Hartfield, MIPC C. V. Smith, NMSS R. J. McTiernan, 0IA R. G. Ryan, OSP R. Minogue, SD
-J H. K. Shapar, ELD "a" MINARY NOTIFICATION iip 903120068 771202 PDR 18 E PNO-77-216 PDR
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