ML19031A915
| ML19031A915 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 02/15/1977 |
| From: | Schneider F Public Service Electric & Gas Co |
| To: | O'Reilly J NRC/IE, NRC Region 1 |
| References | |
| LER 1977-007-01 | |
| Download: ML19031A915 (4) | |
Text
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~eguiatory Docket fill
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Frederick W. Schneider Vice President Publi.c Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 201 /622-7000 Production Mr. James P. O'Reilly Director of USNRC Office of Inspections Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Mr. O'Reilly:
LICENSE NO *. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 77-07/3L February 15, 1977 Pursuant to the requirements of Salem Generating Station Unit No. 1 Technical Specifications, Section 6. 9. 1,. we are submitting Licensee Event Report for Reportable Occurrence 77-07/3L.
This report is required within thirty (30) days of the occurrence.
CC:
Director, Office of Inspection and Enforcement (30 copies)
Director, Off ice of Manag.ement Information and Program Control (3 copies)
Sincerely yours, 1~112
Report Number:
Report Date:
7-)7/3L 2-3-77 Occurrence Date:
1-20-77 Facility:
Salem Generating Station Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:
No. 12 Steam Generator Steam Flow Channel II Inoperable.
CONDITIONS PRIOR TO OCCURRENCE:
Operational Mode 1 Reactor Pwr:
22%
Generator:
140 MWe DESCRIPTION OF OCCURRENCE:
On 1-20-77 No. 12 S/G Steam Flow Channel II was declared inoperable due to erroneous high steam flow signals.
Technical Specification Action Statement No. 14 for LCO 3.3.2.1 was implemented and No. 12 S/G Steam Flow Channel II was placed in the tripped position.
DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:
A negative slope in the low pressure sensing line causes condensation to collect in the low point which~blocks the required steam flow to the condensate pot.
This blockage allows the steam in the sensing line to condense, lowering the pressure on the low pressure side of the steam flow transmitter causing a false high steam flow signal.
ANALYSIS OF OCCURRENCE:
Technical Specification Action Statement No. 14 for LCO 3.3.2.1 states that with the number of operable channels one less than the total number of channels, operation may continue until the performance of the next required channel functional test,- provided the inoperable channel
, is placed in the tripped condition within one hour.
No. 12 S/G Steam Flow Channel II was placed in the tripped condition within the one hour allowance, therefore the Technical Specifications were not violated.
At no time was there any danger to the health and safety of the general public or site personnel.
..... ~ - :aepor-t;. 77-07/3L 2-3-77 CORRECTIVE ACTION:
I Design chang~ ED-0047A was developed by the Engineering Dept.
This change modified the low pressure sensing line and the root valve orientation eliminating any possible condensate build-up.
After implementation of ED-0047A all new welds were examined by MT method.
New piping between the root valve and the transmitter was hydrostatically tested.
Piping between the root valve and the Main Steam Header was tested in-service at Hot Standby conditions.
FAILURE DATA:
This is the second failure of this type.
The Engineering.Dept.
is initiating a similar design change that should be accomplished on all Steam Flow Transmitters not already modified.
This change should be accomplished during the next scheduled outage.
Prepared by T. L. Spencer SORC Meeting No.
13-77
)
CONTROt. BLOCK LICENSEE NAME REPORT REPORT LICENSEE EVENT REPORT*~
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LICENSE NUM8ER LICENSE TYPE CATEGORY TYl'E SOURCE OOCKET NUM8ER EVENT CATE EVENT TYPE REPORT CATE
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CON'T~; I OJ ~ 'iaJ
~? I 51 0 I ~I 0 I 2 I 71 2J I 01 11 2! 01 71 71 69 74 I 01 21 0!.21 71 lJ 75 EVENT DESCRIPTION
@:El! During Mode 7
8 9 1 operation, No. 12 S/G Steam Flow Channel II was declared I so
@:§}
inoperable due to_erroneous steam flow signals.
No. 12. S/G Steam Flow 7
8 9
@E] I Channel I was operable throughout 7
8 9 this occurrence.,Piping was modifiedJ This is the second occurrence of I
lfil!ll to eliminate condensate build-up.
7 89 80
~I this type (Ref. 76-18/3L).
This event 77-07/3L.
1*
7 8 9 SYSTEM - CAUSE CODE CODE
@mtI IA I rn.J 7
8 9 10
.11 COMPONENT COCE IXIXIX!XIXlXI 12 17-c:AUSE DESCRIPTION PRIME COMPONENT SUPPLIER LbJ 43 COMPONENT MANUFACTURER I Fl 11 21 01 44
- 47 80 VIOLATION lliJ 48
~I Condensate collecting in flow transmitter sensing leg due to incorrect I
@Jfil'i9 slope of piping caused erroneous steam flow signals.
j 7
89 80
. [@].,,._ _________________________________ ~------~--------~--------~----~
1 89
(
80 FACILITY STATUS
[ffil L.§J.
7
- u.
9 FORM OF
'POWER' I 0 1212 I 10 12 METHOD OF OTHEfil STATUS CISCOVERY l~,__-N_/~A--~-.-!I l.gj 13 44 45 DISCOVERY DESCRIPTION
!Received High Stm. Flow Signal!
~
so ACTIVITY CONTENT RELEASED OF RELEASE AM9.UNT OF ACTIVITY GE
~ L!J I
N;A I
LOCATION OF RELEASE I
~I __
N_A __
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1 8
9 10 11 -
44 45 80 PERSONNEL EXPOSURES NUMBER TYPE CESCRIPTION-1 O IO IO I lfil i-z.I _____
N..._/=A ________________
J...i 7
9 11 12 13 lliS PERSONNEL INJURIES NUMBER CESCRIPTION GE]IOIOIOll ~ ______ _.___.N~/_A ______________ _..._ __________________ -=I 7
8 9 h
12 80 OFFSITE CONSEQUENCES
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N/A LOSS OR DAMAGE TO FACI LITV TYfltt 0£5CAIPTION l111t;J -~~o------------~N~/~A~---------.---------------~-------aJ PUB LI Cl TV Glil~---------------------1-"'1--------------------------------------~
7 89 80 ADDITIONAL FACTORS III!Jt~-------------------~N~/A..._ ____________________________________ -.....tj 1
a9 ii II]!]'::-----------------------~----------------------------------------=
1 a 9 80 NAME:_-__ T
.--'L--.~__...s'""p..__e... n'""c_e_r_. _______ __
PHONE: ( 609) 3-65-7000. Ext.Salem-52