ML17346A293
| ML17346A293 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 03/16/1984 |
| From: | Heltemes C NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Wells R C-E OPERATING PLANTS OWNERS GROUP, NORTHEAST UTILITIES SERVICE CO. |
| Shared Package | |
| ML17346A290 | List: |
| References | |
| NUDOCS 8404130047 | |
| Download: ML17346A293 (7) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISStON WASHINGTON, D. C. 20555 MnR Z 6 tg~
Mr. Richard Wells, Chairman CE Owners'roup Northeast Utilities Service Company P.O.
Box 270 Hartford, Connecticut 06101
Dear Mr. Wells:
Subject:
Case Study Report - Low Temperature Overpressure Events at Turkey Point Unit 4 Following resolution of peer review comments, we have completed the enclosed study of low temperature overpressure events.
This study concentrates on two overpressure events that occurred at Turkey Point, Unit 4, but also considers related events at'other pressurized water reactors occurring after 1979 when the staff resolved the generic issue entitled, "Reactor Vessel Pressure Pro-tection (Overpressure Protection)."
The report provides:
(1) an analysis and evaluation of the Turkey Point events; (2) a review of operating events that have challenged the low temperature over-pressure protection (LTOP) systems; (3) evaluation of the LTOP technical speci-fications; (4) an evaluation of water solid operation during the low temperature regime; and (5) recommendations that, if implemented, could reduce challenges to the overpressure protection system and strengthen its mitigatory capability to minimize the potential se'verity of overpressure events.
You will note that there is an activity identified for the nuclear industry, to further evaluate the necessity for water'olid operation and consider developing a recommended operating practice for filling and venting which excludes water solid, conditions.
As one of the leading industry representatives, I encourage you to pursue this activity in the interest of improving reactor safety.
The recommendations contained in this report are under review within the Nuclear Regulatory Commission.
The report is being forwarded for your information and use as you deem appropriate.
If you have any questions regarding this report, please contact Wayne 'D. Lanning
~ of my staff.
Mr. Lanning can be reached at (301) 492-4433.
Sincerely,
(84Q4>SOON 84OS>e PDR ADOCK OSQQO251 PDR-'.
J 1
- emes,
, Director Offic or Analysis and Evaluation of Operational Data
Enclosure:
As stated cc:
See page 2
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Mr. Richard Wells flag 3, g ]g8g cc:
w/o enclosure Mr. Joseph
- Sheppard, Chairman Carolina Power 8 Light Company Dr. David Rossin, Director Nuclear Safety Analysis Center Mr. Eugene P. Wilkinson, President Institute of Nuclear Power Operations Dr. Paul L. McGill, President Combustion Engineering Inc.
Mr. E.
P.
- Rahe, Manager Westinghouse Electric Corporation
MAR 1 6 tgg4---
Nr. Richard Wel 1 s, Chairman CE Owners'roup Northeast Utilities Service Company P.O.
Box 270 Hartford, Connecticut 06101
Dear Hr. Hells:
DISTRIBUTION:
7DK-AEOD CF R08B CF ROAB RF WLanning TAIppo1 ito CJHe 1 temes KVSeyfrit
Subject:
Case Study Report Low Temperature Overpressure Events at Turkey Point Unit 4 Fol 1 owing resolution of peer revi ew comments, we have completed the enclosed study of 1 ow temperature overpressur e events.
This study concentrates on two overpressure events that occurred at Turkey Point, Unit 4, but also considers related events at other pressurized water reactors occurring after 1979 when the staff resolved the generic issue enti tled, "Reactor Vessel Pressur e Pro-tection (Overpressure Protection)."
The report provides:
( 1 )
an ana)ysi s and evaluation of the Turkey Point events; (2) a review of operating events that have challenged the 1 ow temperature over-pressure protection (LTOP) systems; (3) evaluation of the LTOP technical speci-fications; (4) an eval uation of water solid operation during the 1 ow temperature rggime; and
( 5) recommendations that, if implemented, could reduce challenges to the overpressure protection system and strengthen its'itigatory capabil ity to minimize the potential severity of overpressure events.
You wil 1 note that there is an activity identified for the nuclear industry to further evaluate the necessity for water solid operation and conpider devel oping a recommended oper ating practice for filling and venting which excludes water solid conditions.
As one of the 1 eading industry representatives, I encourage you to pursue this activity in the interest of improving reactor sa fety.
The recommendations contained in this report are under review within the Nuclear Regulatory Commission.
The report is being forwarded for your information and use as you deem appropr iate.
If you have any questions regarding this report, please contact Wayne D. Lanning of my staff.
Nr. Lanning can be reached at
( 301 ) 492-4433.
Sincerely, Original signea bye Origin@ g,~%@AS, J1'oI C. J.
Hel temes, Jr., Director Office for Analysi s and Evaluation of 0 erational Data AE0 TA 1 to CJ 1lemes ROAB )~
WLann4+/cj ROAB:
KVSeyfrit OFFICE "SURNAME BlE1 BMlr{ '
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See NRc FORM 318c t2-82) NRCM 0240
'FFICIALRECORD COPY
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Mr. Richard Wells f)MR I 6 )g8y cc:
w/o enclosure Mr. Joseph
- Sheppard, Chairman Carolina Power 5 Light Company Dr. David Rossin, Director Nuclear Safety Analysis Center Mr. Eugene P. Wilkinson, President Institute of Nuclear Power Operations Dr. Paul L. McGill, President Combustion Engineering Inc.
Mr. E.
P.
- Rahe, Manager Westinghouse Electric Corporation
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