IR 05000293/1988020
| ML20151L685 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 07/18/1988 |
| From: | Kaplan H, Strosnider J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML20151L682 | List: |
| References | |
| REF-GTECI-A-07, REF-GTECI-CO, TASK-A-07, TASK-A-7, TASK-OR 50-293-88-20, NUDOCS 8808040109 | |
| Download: ML20151L685 (8) | |
Text
.
. - - -
_
._
-..
. _ _ _
.
.
'
.
,
.
U.S. NUCLEAR REGULATORY COMMISSION
REGION I
Report No..88-20 Docket No.
50-293 License No.
DPR-35 Licensee:
Boston Edison Company 800 Boylston Street Boston, Massachusetts 02199 Facility Name:
Pilgrim Nuclear Power Station
'T ispection At:
Plymouth, Massachusetts Inspection Conducted: May 2 through June 10, 1988 Inspector:
7/ #//5 J. Kaplan, S ior Reactor Engineer
'date 7/f//##
Approved by:
a Strosnider, Chief Material and
'date rocesses Section Inspection Summary:
Inspection on May 2-6, 1988 (Report Number 50-293/88-20)
Area Inspected: A special inspection was conducted to determine if the licensee had modified the Pilgrim containment in accordance with the licensee's commitments to the Unresolved Safety Issue (USI A-7).
The inspection was focused on the QA aspects of the modification covering materials, welding, and NDE.
Results: The inspector concluded that the work was performed using proper mterials, qualified welding procedures and appropriate NDE methods. No significant violations or deviationc were identified although it did take the
.
licensee an inordinate amount of time to provide certain quality assurance documentation requested by the inspector.
$0E" A8sQ ggggg;;
PNu
.
-
.
,
_
'
.
"
.
.
.'
)
Details 1.0 Persons Contacted Boston Edison Company K. L. Highfill, Station Director T. T. Fidler, Public Relations Representative P. J. Hamilton, Compliance Division Manager D. A. Mills, Construction Manager D. J. Stephenson, Senior Compliance Engineer C. S. Brennan, Nuclear Engineer G. V. Mileris, Nuclear Engineer J. A. Seely, Technical Section Manager N. L. Desmond, QC Division Manager 2.0 Inspection Purpose and Scope The purpose of the inspection was to determine if the licensee'had modified.the Pilgrim Nuclear Power Station in accordance with commitments to NRC concerning. Unresolved Safety Issued (USI A-7).
Technical issue in USI A-7 involved suppression pool hydrodynamic loads on Mark I contain-ment.
These loads were not considered in the original design of the containment. - The licensee submitted a plant unique analysis report (pVAR)
to the NRC to provide a basis for plant modification and the NRC issued a safety evaluation (SER) for Pilgrim in August 1984.
3.0 Findings On May.2-6, 1988, the inspector initially reviewed QA records at the Pilgrim site which were generated by Graver Energy Systems, the principal installer, for containment torus modifications performed during 1980.
Shop fabrication of parts was performed by Pullman Power in 1979. _The work and QA record requirements were specified in Boston Edison Company Speci fication OS-2255-1, Rev.1.
The records vere on microfilm and covered modifications of the torus such as adding support saddles and anchor bolts, adding-ver.t header deflectors, adding downcomer ties and providing a temperature monitoring system.
These modifications are depicted in figures 1 and 2.
Because of '.he problem of locating _ key documents, including Graver's unique identification system for parts and welds, the inspector could not verify wi'S complete certainty that the work was conducted in accordance with the requirements of Section XI of the ASME Code with Addenda through Summer 1978 edition as specified in the owner's specification 05-2255-1 Revision 1.
The inspector requested the licensee to perform an in depth review of the Graver documents and to present their findings to the inspector on an expedited schedule. On June 8, the licensee's representatives provided the inspector with
. collated and well-organized packages, representing certain modifications
,
r
,
...,..
. -.
_
~,
i
.
.:
.
.
selected by the inspector, namely the saadle, deflectors, tie bars and thermowells, the latter containing the temperature detectors for the_
temperature monitoring system.
The inspector reviewed the subject _docu-ments and concluded that there was ample evidence to prove that the modi-fication. work was performed with acceptable quality utilizing proper materials, qualified welding procedures and appropriate NDE techniques.
Identification of materials, parts and welds was established to provide
. positive traceability. Although the weldor qualification record (s) for installation of the thermowells into the torus was not retrieved, dissimilar metal Welding Procedure BE-SMGT1-8N and accompanying qualifica-tion record SMGT-8 were available along with the Weld Distribution Sheet showing the use of the appropriate type 316L filler metal for the subject weld (see figure 2).
It is noted that welding records were not specifical-ly required by Section XI - IWA 6340 or Owner's Specification OS-2551.
The QA records for the four selected modifications are summarized in Table 1.
It is particularly noted that the records showed (see Notes 1, 2 and 3 of Table 1 and Figure 3) that attaching the saddle plates directly to the torus was avoided by prebuttering the torus using a special butterbead/temperbead technique, followed by magnetic particle examination a minimum of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> after completion of welding.
This sequence of operations was performed to preclude brittle areas in the HAZ of the torus and to assure detection of delayed cracking due to hydrogen.
In addition,
'
except for a short period of I day, welding of saddle to the torus was performed with the torus dry.
It is also noted that the QA records indicated that the thermowell to torus welds discussed in the previour
. paragraph were liquid penetrant inspected.
4.0 Quality Assurance f
The inspector reviewed several Boston Edison inspector surveillance i
reports covering Graver activities.
These covered Calibration 80-38, Lubrite Plates 80-49, Electrode Baking Control 88-44, Torus Vent Header Weld Inspection 1-80-74, Welder Performance Qualification 80-77, Saddle plate Welding 1-80-143, and Weld Material Control 80-16.
No significant findings were reported.
5.0 Tour During a tour of the torus the inspector visually examined saddle to torus fillet welds ir. Columns 1 and 16 in Bay Number 1.
All structures and welds were painted thus preventing a meaningful examination of some att-ibutes. The inspector also toured the inside of the torus which was filled with water and confirmed the presence of tie bars, deflectors and l
safety relief quenchers.
I
!
i
{
l
.
.
.
6.0 Conclusion Based on the rtview of the four document packages the inspector concluded that modificat;;.'s of the Pilgrim c,ntainment were performed with accept-able quality ustrg proper materials, qualified welding procedures and appropriate NDE mathods. No violations or deviations were identified.
At no time during the inspection was written material provided to the licensee by the inspector.
(
)
0~
.
-
.
,
.
.
.
'l
VACUUM BREAKER LINE r
[
4;V G
I HEADER DRYWELL
\\
I CAT WALKm j
DEFLECTOR L,
.. _p._. _ p
)
'
.
a VENT
'
. \\DOWNCOMER
/
BELLD WS
....
.. g
..
. - -
.,-..
.--
-RING GIRDER
.
(,
,,
_
,
,
i l
- l
<
'
SRV LINE
%
_
,/
g>
c i
p
g j p-QUENCH ft =
- i J
SUPPORT
,
! ff
$g SADDLE
fi O
- , :G
,,.
,
,
p'.-
..
.. -
'
N = MODIFIC ATIONS
.
.
Fics/6'E / TOR U S CO M POSIT E CR O S S SECTIO N - PILGRI M
..
.
'
,
,
.
.
.
\\
gn 13 y
'
,
'N
'
,
'N TORUS SHELL
~
%s
\\
k,
[Y}y
~%'~
,
d 3N
'
'
}/
.
i..,
,
s I
s
'
.
.
nsvge 7_
THERMOWELL DETAll
. - _
_. _ _ _ _ _ _ -
_
_ _ _
.
..
- -.
_
t
'.
.
....
-...
l 71 ' 1 Note: Temperbead spacing ma'/ vary to i
BUTTERBEAD
-
3/16" max. In areas tels than 1"
'
TEMPERBEAD
-
4-ACM.tjl1 in length. The totallength of
-
-gp4AtM.. <... e.v.. sv.-g 1/3 3/16" range shall be a max.
temperbead spacing within the J
IfA2 af T l y
~
~~
~
of 2"in any 12" of butterbead i
j weld..'
i
-
-
.t.
,
......
.
.
.....
.$
,
FIRST WELDED SIDE SECOND WEl DED SIDE
3.
.I
.s
.
Pass Elec.
Elec.
^rc Current Pass Elec.
Elec.
Arc *
Current No.
Ola.
Type Volts Amps No.
Dia.
Type.
..Velts
. Amps.1
"*
en '[o
,
~
-
t' _A 3/3 Rutt. 1/8 E7018 20-22 120-130 Temp. 1/8 E7018 20-22 140-145
.
.
,
41),.,,
I
_
flGUAE 3 - DurrEpBEep 7'ent"Ef(GBAb TG9^//?*C
useo on rme nu a ru
,+ rrnc.Nwn
,
sn oe le
\\
. -.. - - -. _.,_.. -..
. _. _, _. _. - -. -........ _.... -. - _ _. - _. - -. -,... -. - - _. -. _ _,
.
. - -. -
-,... - -.. -. - - -
_
_ _ _ _ _.
- .:
J.-
,
e.
TABLE 1 SU N RY OF GRAVER ENERGY SYSTEM DOCUMENTS Site
. NDE (4)
-*-
Base Materia l Fi l t e r.Ma te ri a l heceiving.
Welding We lde r (a) (b). Welding Materia l Test Report Test Reogn insoection Procedu re Qualification Visual MT/LP issuance Record Saddle Plate A516 Gr. 70 SFA 5.1 E7018 Pe rfo rmed BE-SM1-1N Ye s ( X-ray ) -
To rus X
(1),(2),(3)
". Tensile SAF 5.20 E70T-1 By Qual.-SM1 71 Shell
" Chemistry Tensile Teledy9e Prior to BE-SM1-TN But te r-
" Cha rpy-O%F Chemistry -20*F
. qual.-Sm 278 Temper-Cha rpy 0 F Bead (a)
-
BF-FCB-TN Qual.-Fc 79 Temper Temper Bead Bead (a).
Fitup or Plate Fillet fillet X
Weld Weld Der f ector SA-516 Gr. 70 SFA 5.1 E7018
---
BE-SK1-1N Yes -' Bends.
" Tensile Tensile Qual.-SM 171 Plate to
" Chemistry Chemistry Supports (a )
" Cha rpy-50* F Cha rpy-20* F SA-106 Cr. B
" Tensile
" Chemistry
" Cha rpy+32'F Tie bar SA-106 Gr. B SFA 5.1 E7018
---
BE-SM1-1N Yes - Bends Fillet X
Tensile Qual. SM 171 Wolds on Chemistry Lugs.(a )
Cha rpy-20' F The rmowe l l SA-479 (Ann'id.)
SFA 5.9 ER316L Pe rfo rmed BE-SMGT1-8N Not Dimen-ID+0D (b)
X
" Tensile Tensile by.
Qual. SMGT-8 Retrievable sional
" Chemistry Chemistry TeIedyne Fit Up Fe rri te Completed Weld NOTES (1) Prior to welding SA 516-70 saddle plates to SA 516-70 torus, a layer or carbon steel weld metal was deposited on torus using a butterbead/temperbead technique.
(2) All welding on torus was performed when torus was dry except for a short period (1 day in Janua ry 1980).
(3)
MT. or saddle to torus welds performed a minimum nr 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> after welding.
(4) Boston Edison surveillance / inspection report 80-39 verified conforrnance of Graver NDE employees to SNT-TC1A-1978.
_