ML18044A789
| ML18044A789 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 04/25/1980 |
| From: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8004280519 | |
| Download: ML18044A789 (3) | |
Text
-*
consumers Power company*
General Offices: 212 West Michigan Ave.nue, Jackson, Michigan 4g201
- Area Code 517 788-0550 April 25, 1980 Director, Nuclear Reactor Regulation Att Mr Dennis L Ziemann, Chief Operating Reactors Branch No 2 US Nuclear Regulatory Commission.
Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - RELIEF REQUEST PERTAINING TO SECTION XI INSERVICE PUMP TESTING*
Consumers Power Company's Palisades Plant will be updating its inservice pump testing program to the 1977 edition of the ASME B&PV Code,Section XI,.with addenda through summer 1978.
This is done in accordance with 10 CFR 50.55a.
Pursuant to 10 CFR 50.55a(g) and the Palisades Technical Specification 4.3.c;_
additional relief from the code is requested (Attachment 1).
This request for relief is in addition to those previously *submitted to the commission, June 13, 1978, and will remain in effect after the code update.
~
David P Hoffman
~
Nuclear Licensing Administ.rator CC JGKeppler, USNRC NRC Resident Inspector-Palisades Aoo1
..s 1/1 f
8004280 5~~
ATTACHMENT I INSERVICE TESTING OF PUMPS REQUESTS FOR EXEMPTIONS TO SECT XI 77S78
- 1.
In general, instrumentation is not available to measure both flow and discharge pressure of the pumps included in the test program.
Previous Code editions allowed measurement of either flow or differential pressure on pumps in fixed-resistance systems, but the 1977 edition now requires both to be measured.
For systems in which the test flow path configurations are duplicated (i.e., system resistance essentially constant), both flow and differential pressure are responsive to pump hydraulic performance, and therefore, either parameter will give adequate information to verify accep-table pump operation.
For monthly tests of pumps in systems which have essentially fixed operat-ing configurations and flow resistance characteristics, therefore, either flow or pressure, but not necessarily both, will continue to be monitored.
This approach is adequate to allow early detection and correction of de-grading pump performance.
- 2.
In the case of the service water system, there is no installed flow instru-mentation.
This system can not be considered a fixed resistance system, however, in that pump flows will vary because of numerous temperature control valve.s which automatically change flows to supplied components.
Since the system heat loads during normal plant operation are essentially constant, ptirnp flows and the resulting discharge pressures can be consider-ed as functions of Lake Michigan water temperature.
On this basis, a graph of expected pump discharge pressures vs Lake temperature was develop-ed using approximately three years operating data (see attachment), and this graph, in turn, has been used as the basis for the pump discharge pressure acceptance criteria as allowed by Article lWP-3210 of the Code.
In the 2 1/2 years this graph has been used, it has shown itself to predict the.pump pressures with reasonable accuracy.
In addition, the flow requirement for service water during normal plant Operation, per the FSA~, is almost identical to the flow required following an MHA (14,275 gpm vs 14,330 gpm).
Therefore, the ability of the service water pumps to handle cooling requirements during normal operation is, in itself, continuous confirmation of the ability of the system to handle the peak heat load following an MHA.
Therefore, for the monthly service water pump tests, a graph of expected pump performance based on historical data will continue to be used to monitor the performance of the pumps.
This method is adequate to allow early detection and correction of degrading service water pump performance.
n..I ~ I YEAR BY WEEKS
- "'ll01';; X 180 DIVISIONS Kl:UP'f'KL
- Kee1n CO, 4EI 3010 IUDI I* U. I. A.
Service Water Disch. Pressure (Two Pumps Operating), psig
~
~
00 00
~
~
0 VI 0
VI O
~
I I I I I I
I l.i' I
-t
~ ( I ii 1 I_
1.lJ _ f J I k
y t... IJ I*
- t+*t++t+i-1_ -*
/
- :.1 :
I J _*' -
~
~.
- ~
~. -..
~~.
I.. v ~ I
- 1-tt1-11-1-11-11-H-11* *rrrrrr....-,,~
~~
-
- 1
- * ;r 1 * *
~.
.. _1*~
t*
.. V
. ' I 'r
~
~/
~......
- r
~~... --*
~:,t*-
- i;~
~~I*
l.. *... -
V
~
t+t*:~
.... l++t+t++H-t-t,1L it-...,;.... ****--
~D..
~~
- -~-
l
~
. ~ :.. :. ~
~.
.. ~
~~:.
- to"
~ ~..
~*
~.
~
I I 11
- If I
I
~
~
v
~I l ~I '*H11
~~
vv
- 1 I 1 11 rl
-~~ -
I.
'I
~ I.
.f. I I *1 1-r....
. t.. I. I
.I
- i
.. t **I*- I.' !
L I
. - +t1-H-t-t 11
... I
\\JI
- /
. ~.
?
-... I -* - v
!i VI
- V
~ I I
~
i+w.i-i+w.i-w.w+w.w+vWtv~.~-1-1m'.~
__ ~
__ +H+++H-H#_'_#.'.H+t+i.. ~
.. ~ftt+t~j-H+H*,J~~*l~
1 ~~~
1
~1'7ffiTHt1Httttttttttttttttttttttttttttm_~. ~ttttttttttm.tt
.. m 1
tt.jrttti 1
~~i i g
]
I 1111 I ijJ!'
I
!t ;*~I
- ~
-H+HH-H-1 t -
- - I f
R ~
... I:
- 1.
!° l-tt-H+,H-t+l+-1...
]
I Ii I l I Ii I
l:lMJ~
~H+l+*H+++i*
1*
I I : I ':.I !I:. ij!, '1'11 'I 11 I frl!~.I~ ~11 0
J
'ii Ii ii, 1~1 i1.
1
' 1 !iH -... I J 1.........,,.,..H-...........,.~.\\~~~ :gJ
~H+l+H+H-IHH+H+++l's
- - 1t 1 J l 1fl f' J -*-...... t ~*-l*-H--H ~+H-t
. ~l~r.:,~~,,I
.I 11 1,-,11,-, !
- '1!1!. i ! '1
!ID';
I~ ~**ii 00 I L I i ' i I i 1' I ! : i ' j,* :
J 1* Ji t.!
~
I,
. *1 1,:.
' I :,, ti.~:
l 1 0
ii I
111*11 i I
'1' 1i lj l
- Ii I I l
IH~
I I.
'\\