ML20147B223
| ML20147B223 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 09/23/1978 |
| From: | David Williams ARKANSAS POWER & LIGHT CO. |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 2-098-17, 2-98-17, NUDOCS 7810100023 | |
| Download: ML20147B223 (4) | |
Text
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-.rs,v-3 ARKANSAS POWER S LIGHT COMPANY POST OFFICE BOX 551 LITTLE ROCK. ARKANSAS 72203 (501) 371-4000 September 23, 1978 2-098-17 Mr. K. V. Seyfrit, Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011
Subject:
Arkansas Nuclear One-Unit 2 Docket No. 50-368 License No. NPF-6 10CFR50. 55(e) Significant Deficiency Foxboro Transmitter Mounting Brackets (FiJe:
2-0520)
Gentlemen:
The subject deficiency was previously reported to Mr. Tom Westerman, Region IV.
Attached is a final report on this deficiency.
Very truly yours,
/i,/
v
,[/ ci '(y '1 f
Daniel H. Williams, Manager, Licensing DHW: CSP:mh Attachment cc:
Mr. W. D. MacDonald, Director Office of Management Information and Program Control i
U.
S. Nuclear Regulatory Commission j
Washington, D. C. 20555 1
Dr. E. Volgenau, Director Office of Inspection & Enforcement Washington, D. C.
20555 BbtR f S 1819 L9 9 923
/pf
_____m_
FINAL REPORT FOXBORO TRANSMITTER MOUNTING BRACKETS INTRODUCTION During review of the qualifications of the safety related transmitters, it was discovered that the standard brackets supplied by Foxboro and used for
-mounting some of the Foxboro Transmitters were not seismically tested.
A list of the affected transmitters is attached.
DESCRIPTION OF DEFICIENCY The standard bracket provided by Foxboro is weak in the center, at the point where a punchout is made to form a pipe saddle.
Qualification documentation for this bracket was not provided by Foxboro because the standard bracket was not used during their seismic tests.
Foxboro had directly bolted this transmitter to a rigid bookend-type fixture during the seismic tests.
SAFETY IMPLICATION Rather than addressing each instrument in turn as tabulated on Attachment No. 1,.the instruments are addressed here in two (2) generic groups.
Assuming for evaluation purposes, that failure of the brackets could cause rupture of the associated instrument lines, loss of these lines (Qp) could cause a potential undetected loss of safety-related fluids. Additionally rupture of the instrument lines associated with Qf transmitters (Q for both prer.sure boundary and functional considerations) will cause loss of safety-related instrument signals.
Both loss of safety-related fluid inventory and loss of safety-related instrument signals are undesirable from a safe shutdown capability standpoint.
(Section 1.7.2 of the ANO-2 FSAR provides the definition for Qp and Qf).
CORRECTIVE ACTION For the Foxboro transmitters, Model Nos. El1GM, ElIDM, EllAH, E13DM, and E13DL a plate welded across the above mentioned punchout will strengthen the standard bracket.
This modified bracket was shaker-table tested and passed the Seismic Category 1 acceptance criteria.
(The modified brackets were also used in our requalification testing - see our August 15, 1978, letter, Williams to Stolz - and performed satisfactorily).
The bracket for Foxboro transmitters, Model #EllGH was modified by adding fillci welds.
This bracket design was seismically analyzed to Seismic Category I criteria.
3 All the bracket modi.ications described herein have been implemented for
{
the subject transmitters at the job site.
i
Attachment:
(1) List of instruments
--....~ -.- -.
J
_.m Attachment #1 LIST OF SAFETY RELATED INSTRUMENTS INSTALLED USING STANDARD FOXBORO BRACKETS Q
Inst. No.
Category Service Description 2FT-5610 QF CSS Disch. From 2E35A 2FT-5616 QP CSS Disch. From 2E35B 2: II5674 QP CSS NaOH Addition TK.
2FT-0710-1 QF EFW Pump B to 2E24A 2FT-0713-2 QF EFW Pump A to 2E24B 2FT-8277-1 QF H2 Pur),e Air Flow 2LT-5691 QP CSS Header A Level 2LT-5659-1 QF NaOH Addition Tank Level 2LT-5668-2 QF NaOH Addition Tank Level 2LT-5658 QP NaOH Addition Tank Level 2FT-0717-1 QF EFW Pump 2P7B to 2E24B 2FT-0718-2 QF EFW Pump 2P7A to 2E24B 2LT-5694 QP CSS Header B Level 2LT-1079 QP 2E24A Wide Range Level 2LT-1179 QP 2E24B Wide Range Level 2FT-8229-1 QF H2 Purge Flow 2PT-0340 QP MS to EFW Pump Pressure i
2PT-0710- 1 QF EFW Pump 2P7B Disch. Press.
l 2PT-0713-2 QF EFW Pump 2P7A Disch. Press.
2PT-1420 QP SW System Disch. Press.
2PT-1417-1 QF SW HDR. #1 Disch. Press.
2PT-1423-2 QF SW HDR. #2 Disch. Press.
2PT-1012 QP SG 2E24A Blowdown Sheet 1 1
r e
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e (c ou t ' d)
Q
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Inst. No.
Category Service Description 2PT-1062 QP SG 2E24B Blowdown 2PT-4623-2 QF RCS Pressure - Low Range 2PT-2419 QP GRW Discharge Header 2PT-5088 QP RCS to LPSI Suction Press 2PT-2425 QP CRW Decay Tank 2T18C 2PT-2414 QP GRW Decay Tank 2T18A 2PT-2420 QP GRW Decay Tank 2T18B 2PT-4601 1.,2,
-3 and -4 QP Pressurizer Pressure 2LT-5692 QP CSS Header A Level 2LT-5695 QP CSS Header B Level 2PDIT-4602 QP RVAP Monitor Loop A 2PDIT-4603 QP RVAP Monitor Loop B 2PDIT-4702 QP RVoP Monitor Loop C 2PDIT-4703 QP RVAP Monitor Loop D 2FT-5101-1 QF llPSI Header #1 Flow 2FT-5102-2 QF HPSI Ileader #2 Flow 2FT-8827-1 QF 2VEF38A Disch. Flow 2FT-8828-2 QF 2VEF38B Disch. Flow 2FT-8833-1 QF 2VEF38B Filter Cleaning Air 2FT-8834-2 QF 2VEF38A Filter Cleaning Air 2PT-5601-1 QF Cont. Pressure 2PT-5602-2 QF Cont. Pressure 2PT-5603-3 QF Cont. Pressure 2PT-5604-4 QF Cont. Pressure 2PT-5105 QP HPSI Ileader #1 2PT-5106 QP HPSI Header #2
....