ML20085F592
| ML20085F592 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 10/11/1974 |
| From: | Flynn J, Slade G CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20085F589 | List: |
| References | |
| AO-22-74, NUDOCS 8308230036 | |
| Download: ML20085F592 (9) | |
Text
,
J-J.MJ M
- Tele ram.
tuestem umon w
1976 0CT l l Fj; ;: l7 VEB219(1558)(l-028815C284)PD 10/11/74 1545 TLX CONSPOWER JKN
.}
ZCZC 004 DLY ' JACKSON MICHIGAN 10 @ 74 PMS US ATOMIC ENERGY COMMISSION
}N [-
799 ROOSEVELT ROAD k
BY_.1)
TE D TIME /ONA A D4 PTS ELIVER.
9 30,jo/OR ghj
/g g Ja 9 6, g
/
1.
REPORI NO - A0-22-74, DOCKET
%~
2.
A.
REPORT DATE 11-74 53 8.
OCCURRENCE DATE 10-74
/\\.,
3.
FACILITY - PALISADES PLANT gaggo360500 5
yr.im ns.>
g PDR M, M
' Telegram 4.
IDENT[FICATION OF OCCURRENCE -
LOW FLOW TRIP SETPOINTS FOR 3 PCP AND 2 PCP OPERATION FOUND TO DE BELOW TECHNICAL SPECIFICATIONS LIMIT.
5.
CONDITIONS PRIOR TO OCCURRENCE -
PLANT OPERATING IN 4 PCP CONFIGURATION AT POWER LEVEL OF X 30 PER-CENT.
6.
DESCRIPTION OF OCCURRENCE -
A.
A PPOSSIBLE VIOLATION WAS DETECTED 10-3-74 WHEN P-CE-3962 sr.im <nne>WAS REVIEWED AND IT WAS FOUND THAT PRESENT SETPOINTS APPEARED
k
' Tele 9 ram mas u.
t usestern union res LESS CONSERVATIVE THAN THOSE RECOMMENDED IN P-CE-5962.
THIS INFORMATION WAS VERBALLY RELAYED TO RON COOK ON 10-4-74.
B.
FURTHER ANALYSIS OF AVAILABLE INFORMATION VAS CONDUCTED BOTH AT THE PLANT AND IN THE GENERAL OFFICE AND ON 10-10-74 A PRC MEETING WAS HELD AT THE PLANI WITH FIVE MEMBERS OF THE GENERAL OFFICE STAFF PRESENT.
AT THIS TIME IT WAS DETERMINED THAT THE SETPOINTS FOR 5 PUMP AND 2 PUMP OPERATION WERE BELOW IECHNICAL SPECIFICATION LIMITS.
7.
APPARENT CAUSE -
7
.--..-.--..nm.Trun TDTP 4FTPOINTS FOR W EE
- Tele 9 ram
.-x usestern union s si ALL PUMP COMBINATIONS IT WAS ASSUMED THAT FLOW WAS EQUAL TO THE SQUARE ROOT OF DP - BASED ON A4 PUMP DP AS 100 PERCENT - FOR ALL PUMP CONFIGURATIONS.
IT HAS BEEN DETERMINED THAT THE SQUARE ROOT RELATIONSHIP IS ONLY A VALID ASSUMPTION WHEN THE FLOW CORRESPOND-ING TO EACH PUMP CONFIGURATION IS ASSUMED TO BE 100 PERCENT FLOW IN CALCULATING EACH IRIP SETPOINT AND THE PERCENT OF 4 PUMP FLOW CON-VERTED TO A PERCENT OF 5 PUMP - OR 2 PUMP - FLOW TO ESTABLISH THE MINIMUM TRIP SETPOINY.
ORIGINAL CALCULATIONS SHOWED THAT 90 PERCENT OF 5 PUMP FLOW - AND 2 PUMP - WAS MORE CONSERVATIVE THAN THE CALCULATED MINIMUM SETPOINT
, AND THIS VALUE WAS USED.
THE TRIP SETPOINT BECAME --
I l
\\
semOWIRIP/ EQUALS 0.9E2 X DP5 1
b
8 tele ram R A E E.E mestern union -
sv EQUALS 0.81 X DP5 HOWEVER, ASSUMING MEASURED 5 PsMP FLOW - F3 - EQUALS.758 0F MEASURED 4 PUMP FLOW - F4 - AND USING 71 PERCENT OF 4 PUMP FLOW TRIP AS A SETPOINT, THE PREVIOUSLY CALCULATED SETPOINT IS SHOWN TO BE IN ERROR.
E.G.
F5 EQUALS.75dF4 F/THIP/ EQUALS
.71F4 EQUALS
.71 73
.758 8F 12Cl (RS4 )
e I
^
w
- Western, union DP5/ TRIP / EQUALS
.71 E2 X DP5
,758 A SIMILAR ANAYYSIS ALSO SHOWS THAT THE 2 PUMP TRIP SETPOINT WAS AL SO BELOW TECHNICAL SPECIFICATIONS LIMITS.
6.
ANALYSIS OF OCCURRENCE -
SINCE THE PLANT HAS NOT OPERATED IN THE 2 OR 5 PUMP CONFIGURATION AT POWER NO SAFETY LIMITS WERE VIOLATED.
ALSO BECAUSE ALL INFORMA-TION USED TO DETERMINE THE TECHNICAL SPECIFICATION LIMITS IS NOT IMMEDIATELY AVAILABLE, THE DETERMINATION AS TO POSSIBLE SAFETY
' W PROBLEMS HAD THE PLANT OPERATED IN THESE MODES HAS NOT BEEN ANALY2ED
_ _ - - - - = _.
1
- l c-
- Tele ram I
- 5.E.5 E.5
=
toestern union.
I w
l 9.
CORRECTIVE ACTION-l CORRECTIVE ACTION RECOMMENDED BY THE PLAN
)
A.
INITIATE ADMINISTRATIVE CONTROLS TO LIMIT REACTOR OPERATION
^
j IN THE 2 PUMP MODE TO THE HOT STANDBY CONDITION UNTIL THE PROPER l
FLOW TRIP SETPOINTS ARE ESTABLISHED.
^
B.
SET THE HIGH POWER TRIP SETPOINT FOR 5 PUMP OPERATION AT 25 PERCENT POWER.
THIS IS BASED ON THE FACT THAT NORMAL 2 PUMP OPERATION ALLOWS 25 PERCENT REACTOR POWER, AND THE 5 PUMP FLOW TRIP SETPOINT PRESENTLY ESTABLISHED I WELL ABOVE Tile 46 PERCENT
_ _ 4._..
r e c u core ifarT roR 9 PilMP FLOW.
GIVEN THAT FLOW EXCEEDS THE t
I k_-!
NM
- ele ram T
' M tuestern union
- =s.
l l
l MINIMUM ALLOWABLE FOR 25 PERCENT, THE POWER LEVEL OF 25 PER-CENT IS CONSERVATIVE.
C.
CP C0 IS ALREADY ENGAGED IN DISCUSSIONS WITH COMBUSTION EN-GINEERING TO ESTABLISH JUSTIFICATION FOR NEW LOW FLOW IRIP SET-POINTS.
WHEN THIS DATA BECOMES AVAILABLE, A TECH SPEC CHANGE WILL BE INITIATED TO ALLIEVIATE THE PRESENT SITUATION.
- 10. FAILURE DATA -
NOT APPLICABLE l....
-~..
l i
f Wu Tele ram tuestern union i
w !
i G B SLADE/J P FLYNN PALISADES PLANT ALL H0 CC-R 8 SEWELL R L HAUETER NNNN l
?
DCT 1 g 197_;
s sF-1201 (R$-69) l
.,,--,---,,-,n
-,.,--,,,,_