ML17346A292
| ML17346A292 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 03/16/1984 |
| From: | Heltemes C NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Rossin D NUCLEAR SAFETY ANALYSIS CENTER |
| Shared Package | |
| ML17346A290 | List: |
| References | |
| NUDOCS 8404130046 | |
| Download: ML17346A292 (6) | |
Text
ga.> R<Gu~
P0 0 ++**+
UNITED STATES PIUCLPAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 MaR16 1984 Dr. David Rossin, Director Nuclear Safety Analysis Center 3412 Hillview Avenue P.O.
Box 10412 Palo Alto, California 94303
Dear Dr. Rossin:
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
'o the overpressure protection system and strengthen its mitigatory capability to minimize the potential severity of overpressure events.
You will note that there is an activity identified for the nuclear industry to fur ther evaluate the necessity for water solid 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.
F 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.
Nr. Lanning can be reached at (301) 492-4433.
Sincerely, 8404130046 840316
C.
He 0",
, Director Of&
for Analy and Evaluation of Operational Data
Enclosure:
As stated cc:
See page 2
t%l fC y
Dr. David Rossin ViAR18 )g84 cc: w/o enclosure Mr. Joseph
- Sheppard, Chairman Carolina Power
& Light Company Mr. Richard Wells, Chairman Northeast Utilities Service Company 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
Or. David Rossin, Director Nucl ear Safety Analysis Center 3412 Hil1 view Avenue P.O.
Box 10412 Palo Alto, California 94303
Dear Dr. Rossin:
MAR X 8 )gag AEOD CF ROAB CF ROAB RF WLanning KVSeyfrit TAIppolito CJHeltemes
Subject:
Case Study Report - Low Temperature Overpressure Events at Turkey Point Unit 4 Fol 1 owi ng resolution of peer review comments, we have compl eted the encl osed study of 1 ow temperature over pressure 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 occur ing after 1979 when the staff resolved the generic issue entitl ed, "Reactor Vessel Pressure Pro-tection (Overpressure Protection)."
F The report pr ovides:
(1) an analysis and evaluation of the Tur key Point events;
( 2 )
a revi ew 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 evaluation of water solid operation during the 1 ow temperature regime; and
( 5) reccnmendations that, if impl emented, coul d reduce challenges to the overpressure protection system and strengthen its mitigatory capability to minimize the potential severity of overpressure events.
You wi1 1 note that there is an activity identified for the nuclear industry to further evaluate the necessi ty for water sol id 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 dean appropriate.
If you have any questions regarding this report, please contact Wayne D. Lanning of my staff.
Hr. Lanning can be reached at (301) 492-4433.
Sincerely, Original sigued by~
C J. Heltemes, Jr, CD II. Heltemes, Jr., Director Office fot Analysis and Evaluation of Operational Data ROAB:~
~ ~ ~
~ ~ ~
~ ~ ~ 0'
~ ~
KVSeyfrit RAOB WLanniC'cj igjt84" AEOD:
AEOD'D.,
~
~
~
~ ~ ~
~
~ ~ ~
F 0 '
~
TA to C
emes
~.....
Enc3.os's stat
"""'dc':"
S'ee'FFICE SURNAME R
F 0 '
~
d
~
~
IR ~ ~ ~ ~
~
~ a ~
pa'ge'
~l'
~ ~ ~ \\ ~ ~
~
~ ~ ~ ~
r /~1 /S4
~ ~ ~ ~ ~ ~ ~ ~ ~
~ ~
~ ~ ~ ~ ~ ~
~
~ ~ ~ ~
gee
~ ~ ~ ~ ~ ~ ~ o )/
/84 o ~
~ ~ ~ ~ ~ ~ ~ ~
~ /~~ /S4 OATE
~ ~
~
~ I ~ 0 ~
~ ~ ~ ~
~ ~ ~ ~ a NRC FORM 318C (2-82) NRCM 0240
" 'PPICI~L'ECORD CgPy
Dr. David Rossin cc: w/o enclosure Mr. Joseph
- Sheppard, Chairman Carolina Power 8 Light Company Mr. Richard Wells, Chairman Northeast Utilities Service Company 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