ML19210A112
| ML19210A112 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/07/1978 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| GQL-1110, NUDOCS 7910240830 | |
| Download: ML19210A112 (2) | |
Text
0?fl3#7' s
REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
DISTRfBUTION FOR INCOMING MATERIAL 50-239 REC-REID R W ORG: HEREEIN J G NEC DOCDATE:,0.2207/78 METROPOL EDISON DATE RCVD: 07/1S/7E DOCTYPE: LETTER NOTARIZED: NO
SUBJECT:
COPIES RECEIVED RESPONSE TO NRC REOUEST.
LTR 1 ENCL 0 FURNISHING INFO RE TECH SPEC CHANGE REQUEST NO 71A, CONCERNING PEAK CLADDING TEMPERATURE AS AFFECTED BY THE VENT TIME.
FLANT NAME: THREE MILE ISLAND UNIT 1 REVIEWER INITI AL:
XJM DISTRIBUTOR INITIAL:,g
- DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS ***************
GENERAL DISTRIBUTION FOR AFTER ISSUANCE OF OPERATING LICENSE.
(DISTRIBUTION CODE A001)
FOR ACTICN:
BR CHIFC "o""4 BC**LTR ONLY(7)
INTERNAL:
_PRA FILE **L TP OF" 1)
I & E**LTR ONLY(2)
NRC PDR**LTR ONLY(1)
OELD**LTR ONLY(1)
HANAUER**LTR ONLY(1)
CORE PERFORMANCE BR**LTR ONLY(1 AD FOR SYS & PROJ**LTR ONLY(1)
ENGINEERING BR**LTR ONLY(1)
REACTOR SAFETY BR**LTR ONLY(1)
PLANT SYSTEMS BR**LTR ONLY(1)
EEB**LTR ONLY(1)
J.
MCGOUGH**LTR ONLY(1)
EFFLUENT TREAT SYS**LTR ONLY(1)
EXTERNAL:
LPDR'S HARRISBURG, PAu*LTR ONLY(1)
TERA **LTR ONLY(1)
NSIC**LTR ONLY(1)
ACRS CAT B**LTR ONLY(16)
/
1489 143
)N~,
DISTRIBUTION:
LTR 40 ENCL 0 SIZE: 1P CONTROL NBR:
781940016 THE END
- /
(
7910240 h3C)
7 ff272 ap.,
j
'd.:::,,
nu m monu
/
/
METROPOLITAN EDISON COMPANY 2rcie ce rms m.rc enunc cwce.cin POST OFFICE BOX 542 READING, PENNSYLVANI A 19603 TELEPHONE 215 - 929-3001 July 7, 1978 GQL 1110 Director of Nuclear Reactor Regulations Attn:
R. W. Reid, Chief
/y%,f, Cperating Reactors Branch No. h N L. ', 7 %.,
U. S. Nuclear Regulatory C0==issien M Ih, ', ' ',, '
Washington, D. C.
20555
- 2.
~
'.' s h, ? r,
Dear Sir:
'/*4' 4!. /,f'%,
Three Mile Island Nuclear Station Unit 1 (31I-1)
Operating License No. DFR-50 Docket No. 50-289 In response to a telephone request, by your Mr. G. B. Zvetzig to our Mr.
R. J. Stevens, ve are submitting this letter.
Mr. Zvetzig's questien, based en our Technical Specification Change Request No. TlA, concerned the peak cladding temperatures as affected by the vent valve opening time.
The large break LOCA analysis for the DiI-l NSS, which is reported in BAW-10103, was reviewed and it was determined that, with the exception of the first 0.2 seconds of the reficoding phase of the accident, a cressure dif-ferential in excess of 1.0 psig, was maintained across the vent valves.
Therefore, making a conservative evaluation, the vent valves vould remain fully open during reflooding, except for the first 0.2 seconds. For the analysis in BAW-10103, the vent valves were assumed always to be fully open. Thus, the proposed change could only have a 0.2 second effect. Even if it is assumed that the cladding vculd undergo an adiabatic heatup, over the 0.2 second interval, peak cladding temperature vould increase by only T F.
In actuality, the 0.2 second interval vould be decreased by the rapid increase in upper plenus pressure that vould occur with the vent valves closed. Additionally, ever the 0.2 second delay, the heatup veuld not be adiabatic. The expected increase in cladding temperature vould be only 3 F.
Thus, the cladding temperatures reported in BAW-10103 are essentially unaf-fected by the proposed change.
Sincerely,
/
fA.-.
J. G. Herbein Vice President-Generation JGH:RJS:cjg 1489 149 g\\
o h
4, g
'?1 N 01: