ML20206F883
| ML20206F883 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 04/30/1999 |
| From: | Chandu Patel NRC (Affiliation Not Assigned) |
| To: | NRC (Affiliation Not Assigned) |
| References | |
| GL-95-07, GL-95-7, TAC-M93536, NUDOCS 9905060264 | |
| Download: ML20206F883 (3) | |
Text
-
April 30, 1999 MEMORANDUM TO: Docket File FROM:
Chandu P. Patel, Project Manager, C2ction 1 ORIG. SIGNED BY Project Directorate IV & Decommissoning Division of Licensing Project Management Office of Nuclear Reactor Regulation
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION ON RESPONSE TO GENERIC LETTER 95-07 FOR V!ATERFORD 3 ( TAC No. M93536)
The NRC staff will discuss the attached draft for additional information with Entergy Operations, Inc. (EOl), regarding EOl's response to Generic Letter 95-07, " Pressure Locking and Thermal Binding." The staff will arrange for a conference call after EOl has adequate time to prepare for the conference call.
Docket No. 50-382
Attachment:
As stated DISTRIBUTIQbl:
Docket File PDIV-1 Reading RGramm PUBLIC Document Name:G:\\WATFINAL\\NOT9507.WPD To receive copy of document, indicate:
"C" copy "N" no copy OFFICE PDIV-gM PDIV-JM NAME C. Pail C
(.Berrh
- N DATE Q /?D /99
) /h/99
/
/99
/
/99
/
/99 DFFICIAL RECORD COPY i
\\
m 9905060264 990430
[
ADOCK 0 2
%DR v
vou w
]gu g pv
(
f"*%%
UNITED STATES p3 s
NUCLEAR RECULATORY COMMISSION 8
WASHINGTON, D.C. 30000 40M k'MDT April 30,1999 MEMORANDUM TO: Docket File FROM:
Chandu P. Patel, Project Manager, Section 1 D O [N Project Directorate IV & Decommissioning DMalon of Licensing Project Management Office of Nuclear Reactor Regulation i
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION ON RESPONSE TO GENERIC LETTER'95-07 FOR WATERFORD 3 ( TAC No. M93536)
The NRC staff will discuss the attached draft for additional information with Entergy i
Operations, Inc. (EOI), regarding EOl's response to Generic Letter 95-07, " Pressure Locking and Thermal Binding." The staff will arrange for a conference call after EOl has adequate time to prepare for the conference call.
Docket No. 50 382
Attachment:
As stated
. smem
..w..
e s
.e ew. e +..
w-e,
Request For AdditionalInformation Generic Letter 95-07, Waterford 3 1.
Entergy Operations, Inc.'s (EOl's), February 18,1996, submittal states timt valves equipped with a bonnet relief valve were exempted from consideration forf,lydraulic and boiler effect ( thermal induced) pressure locking. The NRC considsm that a bonnet relief valve will limit the pressure in the bonne' but does not irate)(e potentialfor pressure ',ocking because bonnet pressure can still(xceed
^ ' ' tnd downstream I
pressure when the valve is required to open. Noj(nall/ a pressure' lob&ig analytical method is used to calculate the thrust required 10 o' en the
'dQring pressure p
conditions and the calculation assurhos that bo,hnot pro at the telief talvey s
setpoint. The results of the calculation demonptrate e margin vesn'calcu ated pressure locking thrust and ' actuator capability is ~ '
~"
le. Were any considered not susceptible to pressure locking based odyour bonnet relief valve screening criterion?
N){
2.
EOl's February 13,1996, submittal states that.Entergy ~ Method used a slidhg 4
coefficient of friction for stellite on stellite tif(L40 Verify thythis,sa,me sliding coefficient is consistent with the Genede' Letter 8(9-10 Progra galiding coefficient.
. W O$h N.
Y I
3.
Explain why the emergency feedwa er turbine steam sup valves MS-401 A/B are not susceptible to pressure lockin islid the 'b
'V 4.
Explain why the shutdown g su valves. 1-401 A/B, SI-405A/B, SI-407NB, are
(
not susceptible to pressure 16cking drxj therrnalI1nding. The Inservice Testing Program l
stat that these
' closed naives have an active open function.
gjyg 5.
ruary 1,1996, mittal states that packing leakoff lines were modified to vent bonnets of the'shutdovin cooling heat exchanger inlet and outlet valves, SI 125A/B, Sl412A/B, to the upstream p!;iing to eliminate the potential for the valves to pressure I
lock. Ve thalthis wa's corrdctive action that was implemented.
I sk l
6.
I any a that were discussed in the February 13,1996, submittal because i
ey were equi' '
witWa bonnet drain or there was a hole in the valve disk.
V 4
i
..- ~ - -
- - - =.m
.: ~- -= r
}
- - - - -