ML18025A664
| ML18025A664 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 08/15/1978 |
| From: | Curtis N Pennsylvania Power & Light Co |
| To: | Grier B NRC |
| References | |
| Download: ML18025A664 (3) | |
Text
REGULATORY INFORMATION DISTRIBUTION SYSTEM
< RIDS)
DISTRIBUTION FOR INCOMING MATERIAL 50-387 8
DOCD ATE: 08/15/78 DATE RCVD: 08/22/7:
REC:
GRIER 8 H
NRC ORG:
CURTIS N
NO DOCTYPE:
LETTER COPIES RECEIVED
SUBJECT:
LTR 1
ENCL 0 FURNISHING CORRECTIVE ACTIONS RE CONSTRUCTION DEFICIENCY INTERIM REPT INVOLVING THE FAILURE OF CERTAIN TYPES OF ANCHOR/DARLING TILTING DISC CHECK VALVES TO CLOSE BY GRAVITY WI.IEN SUCH VALVES ARE INSTALLED IN A VERTICAL RUN OF PIPING.
PLANT NAME: SUSQUEHANNA UNIT SUSQUEHANNA UNIT 2 REVIEWER INITIAL:
XJM DISTRIBUTER INITIAL:
DISTRXBUTIQN OF THIS MATERIAL IS AS FOLLOWS NOTES:
SEND I&E 3CYS FSAR & ALL AMDTS CONSTRUCTION DEFICIENCY REPORT
( 10CFR50. 55E)
(DISTRIBUTION CODE B019)
FQR ACTION:
INTERNAL:
EXTERNAL:
ASST DIR VASSALLO++LTR ONLY(i)
PRG MINER4+LTR ONLY< 1)
EG FXL LTR ONLY(i)
+LTR ONLY(2)
GOSSICK
& STAFF++LTR ONLY(1)
DIRECTOR DPM++LTR ONLY(1)
QAB4+LTR ONLY(1)
AD FOR ENGHLTR ONLY(i)
AD FOR PLANT SYSTEMS+4LTR ONLY(
SD>4LTR ONLY(i)
FERD DREHER/IE~ccLTR ONLY<1)
LPDR~S WILKES BARREi PA+4LTR ONLY(i)
TERA++LTR ONLY( 1')
NSIC~~LTR ONLY(1)
ACRS CAT 8++LTR ONLY<i&)
BR CHIEF LWR03 BC>+LTR ONLY(i?
LIC ASST LWR53 LA~~LTR ONLY<i)
NRC PDRcc<LTR ONLY<1)
OELD~~LTR ONLY(i?
MXPC4+LTR ONLY(1)
DEPUTY DIR DPM++LTR ONLY(i)
DIRECTOR DSScc+LTR ONLY<i?
AD FOR REAC SFTY++LTR ONLY(i>
AD FOR SY
& PROJ+4LTR ONLY<1)
K SEYFRIT/IE++LTR ONLY(1?
CONTROL NBR:
782M01>7 WiF. I THF END
+%%38%+
TWO NORTH NINTH STREET, ALLENTOWN, PA.
18101 PHONE:
(215) 821-5151 NORMAN W. CURTIS Vice Presiderrt-Engineering 8 Constrirction 821-5381 r
r t
August 15, 1978 Mr. Baize H. Grier Director, Region I U. S. Nuclear BegIxlatoxy Cczmission 631 Park Avemxe Eizxg of Prussia, Pez1nsylvazxia 19406 SUSQ3EHANNK STEM EL'ECTRXC STATION BEGABDZNG 2QZHDEg3KKZNG TILTING DISK CHECK VALVES DOCKER NOS:
50-387, 50-388 IZCENSE NcjS:
CPPR-101'PPR-102 ERs 100450/100508 PILE 840-4 PZA-280
Dear Mr. Gri.er:
This re1ates to a deficiency repox~le under the pm'.sion of 10CFR50.55(e).
Ghe initial advisory was given to Mr. Ebneter, NBC-Region I, by Mr. A. R.
Sab'ciL, PP&Ll during a telephone conversation on July 12, 1978.
The dt~iency involves the failure of certain types of Archor/Darling tilting disc check valves to close by gravity wi~ such valves are installecl in a vertical run of pipxzxg.
'Ihe safety implications arise frcmzL a systaIL's izxability to meet established design criteria by virtue of the inability of such valves to consistent1y close and thereby perfazm their intended safety functions.
this cozxLition was initxallyreported by Anctur/Darlizxg ureter 10CFR Part 21 as a generic problEzn.
The Anchor/Darlizg repcxrt was suhnitted to the Office of Izxspection are EnforcEzIIent (Rashizgton, D.C.) on May 23, 1978 axxl subsequently becazae the subject of NFC IE Circular No. 78-15.
An ixxvestigation was performed for the Susquehanna Project ard. it was detexmined that four (4) 3"-9005 tilting disc check valves had the potential for e5chibiting the above type of operating failure.
These valves have been ret1zrxxed to Anchor/Darling for m~icatxons.
Following the successful ccmpletxon of said modifications, they will be considered acceptable to meet th~ intended safety Questions when installed in vertical pipirg runs.
sy82340i87 PENNSYLVANIA POWER 8
LIGHT COMPANY
Mr. Boyce H. Grier August 15, 1978 r
Tb prevent recurrence, the fal1owing steps are bema taken:
1.
The field has been instxuc~ to test all tilting disc check valves to verify that the disc closes properly when oriented for installation in a vertical pipeline,
- and, 2.
The Bechtel St-wctu Specifi'cation willbe revised to require that va1ves willclose by gravity when installed in lines with flaw vert~ally upward.
The installation and testing timetable willbe activities ~
te with c Very truly yours, N. W. Curtis Vice President-Engineering
& Construct ARS:meh cc:-
Mr.. Z.. G. Davis (15)
~ing Director Office of Inspection
& Enfarcanent U. S. Nuclear Regulatory Camission 20555 Mr. G'. HcDonaZB, Directnr (1)
Office of Management Xnfazmation & Pxogrxn Control U. S. Nuclear Eh~tory Camussion 2 555