ML19257D162
| ML19257D162 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 12/14/1979 |
| From: | VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | |
| Shared Package | |
| ML19257D161 | List: |
| References | |
| IEB-79-14, NUDOCS 8002010442 | |
| Download: ML19257D162 (14) | |
Text
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December 14, 1979 INSPECTION OF SAFETY RELATED PIPING SYSTEMS AT Tile VERMONT YANKEE NUCLEAR POWER STATION IN ACCORDANCE WITil NRC IE BULLETIN NO. 79-14 1855 008 Vermont Yankee Nuclear Power Station Governor ifunt Road Vernon, Vermont 05354 8002010 4 4 2_
TABLE OF CONTENTS Page
1.0 INTRODUCTION
1 2.0 SCOPE OF WORK 2
3.0 EVALUATION CRITERIA 2
4.0
SUMMARY
OF RFSULTS 3
Figure 1 Safety related piping systers evaluated within the 7
scope of NRC IE Bulletin No. 79-14 Figure 2 Nonconformances initially dispositioned 10
" Repair / Modification Required" 1855 009.-
N
1.0 INTRODUCTION
In accordance with NRC IE Bulletin 79-14 dated July 2, 1979, (and revised by Revision 1, July 18,1979; Supplement 1 dated August 15, 1979; and Supplement 2 dated September 7, 1979), Vermont Yankee performed an inspection of as-built safety related piping systems comparing as-built piping systems / support to existing design documents.
Accumulation of as-built field data Sr evaluation purposes was completed on October 29, 1979.
Preliminary engineering evaluation of the field data was completed by November 1,1979 resulting in the issuance of 460 Nonconformance Reports, (NCR's).
Subsequent re-evaluation / field inspection of the NCR's resulted in voiding 25 NCR's bringing the final figure to 435. The reason for the large number of NCR's generated is due to self-imposed conservative tolerances for comparison between as-built safety related piping systems / support to existing design documents. The 435 NRC's were categorized as follows during the preliminary engineering evaluation:
A) 234 - acceptable as is B) 143 - further analysis required C) 58 - recommended modifications / repairs Analytical engineering evaluation on piping systems, against which the 143 "further analysis required" NRC's were written, was completed December 3,19 79.
Subsequent re-evaluation of these NCR's was completed Decembe r 12, 1979. 1855 010
2.0 SCOPE OF WORK The safety related piping systems reviewed for which design Isometrics were available, are indicated in Figure 1.
In addition, the following safety related systens were visually inspected for which there are no design Isometrics as a basis for comparison:
Instrument air lines:
IA-2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15, 16, 18, 19 and 20 Ref: Ebasco dwg. G-191160 Instrument air flow diagrams Startup air to the Diesel gene rators :
2h" SA-1A 2h" SA-1B 3.0 EVALUATION CRITERIA Field data on as-built safety related piping systems was taken and recorded in eccordance with Work Instruction-4, BM-9002/WI-4/Rev. O, October 23,19 79, " Piping and Pipe Support Sysums 79-14 Field Data".
Evaluation of the as-built field data was performed in accordance with " Piping Evaluation Criteria (79-14)", BM-9002/Rev. O.
The " criteria" uses Amendment 27 of the Vermont Yankee FSAR as the oasis of system review.
The applicable codes for pipe stress and support review were ANSI B31.1, AISC Manual of Steel Construction, and the ASME Boiler and Pressure Vessel Code Section III.
Where NCR's were generated against systems with excessive gecmetry configurations or support deviations the systems were dynamically analyzed.
The analyses used the computer code PIPE SD, a code in the public domain. i855 01i
The amplified response spectra of Amendment 27 where applied at each applicable elevation as the horizontal excitation.
Vertical excitation was taken as two thirds of the ground response (Figure 2.1-1 of Amendment 27).
In the dynamic analyses direct code checks were made for pipe stress acceptance.
Supports were qualified by comparing the dynamic loads versus the statically applied " Robinson Fix" loads. No attempt has been made at this time to qualify the base plates or the supports to actual dynamic loadings.
Minor deviations in support locations or configurations and geometry variations were qualified by using the stress charts of the " criteria" and/or by actual analyses of the supports with statically applied loads.
.4.0
SUMMARY
OF RESULTS A) " Acceptable as is" The 234 Nonconformances dispositioned " acceptable as is" were done so during the preliminary engineering evaluation phase (October 29 to November 1,1979). These Nonconformances were typically minor geometry changes, support relocations, and minor changes in as-built pipe lengths over design lengths.
B)
" Repair / Modifications Required" The 58 Nonconformances dispositioned " Repairs / Modifications Required" were done so during the preliminary engineering evaluation phase also. These Nonconformances were typically excessive learance gaps between the pipe support and pipe, inactive spring supports, and slack rod hangers.
The dispositions 1855 012
provided for shimming excessive gaps, resetting springs to that indicated on the Grinnell dwgs. and tightening the slack rods.
Figure 2 summarizes the above 58 NCR's and the disposition description.
Of the 58 NCR's, 7 were determined to effect system operability based upon possible overstress in the pipeline for the as-built condition. All 7 repairs have been completed.
C)
"Further analysis required" The 143 Nonconformances requiring further analysis resulted in the following recommended repairs / modifications:
Repairs / modifications required due to code overstress of as-built piping systems:
A)
CS Part 2 Dead load supports CS-HD55B and CS-HD85D must be modified to provide + vertical load capability.
B)
SW Part 10 Deadload supports RSW-H231, RSW-HDl41C, and RSW-HD231B must be modified to provide + vertical load capability.
C)
AC Part 1 New support with vertical and lateral load capability must be added in torus area below floor penetiation at EL. 252'.
Dend load supports RRR-HD205A and RHR-H119 must be modified to provide + vertical load capacility.
D)
SW Part 6 Supports RSW-HD254, RSW-HD39, and RSW-HD177B must be modified to provide + vertical load capability.
856 013 E)
RHR Part 11 Dead load support RHR-HD200C must be modified to provide
+ vertical load capability. Add new support to provide
+ vertical load capability adjacent to support RHR-HD156B.
Base plate for support RHR-HD200E must be stiffened.
Repairs / Modifications Recommended:
A)
CST Pipe Trench.
CST Part 4, CET Part 5, CST Part 7 Support CST-HD19B damaged.
Reconstruct new support adj acent damaged support.
Suppolts CST-H17 and CST-H19 require the repairing of two (2) welds.
Supports CST-HDl9A and CST-HD47B require removal of axial restraint lugs on 10" CST-2 pipe line.
B)
HPCI Part 5 Repair dead load support HPCI-HD35A C)
SW Part 8 Existing support RSW-H212 lateral capability not as per Grinnell sketch and unable to take load. Modification required to stiffen lateral capability.
D)
SW Part 3 Supports RSW-HD247D and RSW-HD245D require removal of U-bolts.
Originally intended as dead load sup ' orts, however, the U-bolts restrict thermal movement of the pipe and induce seismic loads to the support.
E)
CS Part 2
>ve red hanger RHR-HD134B due to restriction on thermal
.ement of pipe.
i855 014 F)
AC Part 1 Support ACSP-H27 requires gaps to be shimmed.
G)
RRR Part 7 Support RHR-H186 requires gaps to be shimmed.
H)
RHR Part 11 Support RHR-H189 raquires gaps to be shimmed.
Support RHR-HD200A require the stiffening of the base plate and pipe clamp.
Support RHR-HD200H require adding stiffener plates to clamps, and replacing the strut and base plate attachment.
I)
HPCI Part 2 Support MS-H8 requires gaps to be shimmed.
J)
SW Part 12 Support RSW-H204 requires gaps to be shimmed.
K)
SW Part 6 Support RSW-H168 requires gaps to be shimmed.
Support RSW-H177 require the replacement of existing anchor bolts.
L)
SW Part 7 Support RSW-HD252 require the replacemant of existing anchor bolts.
All Repairs / Modifications required due to code overstress of as-built piping system from the "further analysis" cycle will be in compliance with USNRC letter to VYNPC dated October 24, 1979; IE Bulletin 79-14.
~1855 015 SAFETY RELATED PIPING SYSTEMS EVALUATED WITHIN THE SCOPE OF NRC
{.
IE BULLETIN NO C 9_1_4_
SHSET NUMBER SYSTFM PART
,_IRACCESSIBLE ACCESSIBLE FW 5
1 FW 5A 1
RCIC 1
1 RCIC 2
1 RCIC 3
1 RCIC 4
1 RCIC 5
1,2 RCIC 6
1 RCIC 7
1 RCIC 8
1 RHR 1
1 RHR 2
1 RHR 3
1 RiiR 4
1 RHR 5
1 2
RHR 6
1,2 RHR 7
1 2
RIIR 9
1 RHR 10 1
bs RHR 11 2,3,4,5 RHR 12 1,2,3,4 RHR 13 1,2,3 RHR 14 1
RHR 15 1,2 MSD 1
1 MSD 2
1 CS 1
1 CS 2
1,2,3 CS 3
1 CS 4
1 CS 5
1 CS 6
1,2,3 CS 7
1 CS 8
1 CS 9
1 CS 10 1
1 HPCI 2
1 HPCI 3
1 HPCI 4
1 HPCI 5
1 1855 016 1
SHEET NUMBER SYSTEM PART NORMALLY INACCESSIBLE ACCESSIBLE m
s HPCI 6
1 HPCI 7
1 HPCI 8
1 HPCI 9
1 HPCI 11/12 1
SLC 1
1 SLC 3
1 SW 1
1,2 SW 2
2,3,4,5 SW 3
1,2,3,4 SW 4
1,2,3 SW 5
1 SW 6
1,2 SW 7
1,2 SW 8
1,2,3 SW 9
1 SW 10 1,2,3,4,5
.91 11 1
SW 12 1
2 SW 13 1
SW 14 1
C SRV 1
1,2 SRV 2
1,2 SRV 3
1,2 SRV 4
1,2 CUW l
1 CUW 4
1 AC 1
1,2,3,4 AC 2
1,2 AC 5
1 SGT 1
1 SGT 3
1 CST 1
1,2 CST 2
1 CST 3
1 CST 4
1 CST 5
1 CST 6
1,2 CST 7
1 RCW 1
1 RCW 2
1 RCW 3
2,3 1,4 RCW 4
1,2 RCW 5
1,2 O
~*~
1855.017
SHEET NUMBER SYSTEM PART NORMALLY INACCESSIELE ACCESSIBLE RCW 6
1 RCW 7
1 RCW 8
1 RCW 9
1,2 RCW 10 1
RCW 11 1,2 RCW 12 1
CRD 2
Line capped-off G removed from service DG 1
1 DG 2
1 DG 3
1 PG 4
1 M.SC.
4 1
The following systems and/or parts of systems were not evaluated, 421/2" p, in accordance with the provision for limiting the scope of work required in NRC IE Bulle+in No. 79-14, Rev.
1.
SHEET NUMBER SYSTEM PART NORMALLY INACCESSIBLE ACCESSIBLE O
RCIC 6
2 RCIC 9
1 RCIC 10 1
MSD 1
2 MSD 2
2 HPCI 10 1
SLC 2
1 SLC 3
2,3 SLC 4
1,2 SLC 5
1 AC 3
1 AC 4
1 CRD 1
1 MISC.
1 1
MISC.
2 1
MISC.
3 1
O 1856 018
_g
(
NONCONFORMANCES INITIALLY DISPOSITIONED " REPAIR / MODIFICATION REQUIRED" (not as a result of further analysis)
NCR SYSTEM REPAIR DESCRIPTION
- 45 SW/16/1/1 Lateral bracing added to stanchion for support RSW-HD270 in C. Tower
- 139 CS/2/1/3 Damaged saddle removed and replaced with shims to pipe CS-HD55B
- 142 CS/2/1/3 Damaged saddle removed and replaced with shim unit CS-H45 169' CS/4/1/1 Anchor installed in CST pipe trench against torus wall CS-H59
- 358 SW/10/3/6 Shim gaps from frame to pipe RSW-H264
- 361 SW/3/2/5 Shim gaps from frame to pipe RSW-H246
- 367 CS/6/1/3 Shim gaps from frame to saddles CS-H52
- 424 CS/6/1/3 Shim gaps from frame to saddle CS-H54 9
HPCI/5/1/1 HPCI-H31 slack rod tightening 14 SRV/2/1/1 Structural Int. (cope angle.near pipe) 26 RHR/11/1/5 RHR-HD189B remove rod slack 68 AC/1/2/4 ACSP-HD34 remove rod slack 84 SLC/3/1/1 SLC-HD23 remove anchor bolts on dl stanchion 99 AC/1/1/4 ACSP-H25 remove rod slack 100 AC/1/1/4 ACSP-HD25 remove rod slack 101 AC/1/1/4 ACSP-HD22A reset inactive spring
)
- 1o _
NCR SYSTEM REPAIR DESCRIPTION C
102 AC/1/1/4 ACSP-HD26A reset inactive spring 116 HPCI/5/1/1 MS-HD22E repair damaged concrete 119 AC/1/3/4 RHR-HD203E > remove rod slack RHR-HD203F 124 AC/2/1/2 ACSP-HD30A reset inactive spring 125 AC/2/1/2 ACSP-HD30B reset inactive spring 126 FDW/5A/1/1 FDW-H24 shim gap to pipe 132 RCW/4/2/2 RCW-HD96A remove rod slack 140 CS/2/1/3 CS-HD46 shim gaps 141 CS/2/1/3 CS-H46 shim gaps 162 RHR/15/2/2 RHR-HD173C reset inactive spring 168 RSW/5/1/1 RSW-H183 shim gaps 178 CST /7/1/1 CST-HD19B shim gaps 188 AC/5/1/1 RHR-HD199 > remove rod slack RHR-HD201A 204 SW/6/1/2 RSW-H172 shim gaps 209 RCW/6/1/1 RCW-H162 add stiffeners to pipe clamp per Grinnell dwg.
221 RCW/8/1/1 RCW-H74 shim gap under pipe
[
224 SLC/1/1/1 SLC-H2 reset inactive spring 267 RCW/4/1/2 RCW-HD156B rod jam nut missing 268 RCW/4/1/2 RCW-H100 shim gaps 269 SW/1/1/2 RSW-H163 shim gaps 270 SW/1/1/2 RSW-H240 shim gaps 280 RCW/2/1/1 RCW-H141 shim gaps 294 SGT/3/1/1 RMISP-H19 shim gaps O
1856 020
-u-
- ~===e..r-
NCR SYSTEM R'iPAIR DESCRIPTION 306 SW/4/1/3 RSW-H249 shim gaps 325 SW/7/2/2 RSW-H256 shim gaps 335 HPCI/7/1/1 HPCI-HD46C remove rod hanger 343 CS/3/1/1 CS-HD57C CS-HD88A > reset springs 352 SW/3/2/5 RSW-HD246E
-stanchion-remove anchor bolts 353 SW/3/2/5 RSW-HD246D
-stanchion-remove anchor bolts 366 CS/6/1/3 CS-H90 shim gaps 375 SW/2/2/5 RSW-HD88D
-stanchion-remove anchor bolts 376 SW/2/2/5 RSW-HD88C
-stanchion-remove anchor bolts 386 RHR 11/4/5 RHR-H191 shim gaps s
392 RHR 15/1/2 RHR-HD172A remove rod slack 407 RCW 12/1/1 RCW-H124 shim gaps 414 RCW 11/2/2 RCW-H123 shim gaps 425 RHR 6/1/2 RHR-HD127J
-stanchion-remove anchor bolts 431 HPCI 11/12/1/1 HPCI-H72 install missing bolt 432 HPCI 11/12/1/1 HPCI-HD119 HPCI-H79B
> remove rod slack HPCI-HD75 446 HPCI 11/12/1/1 HPCI-H71 shim gaps 452 SW/2/4/5 RSW-HD216D remove rod slack 457 CST /4/1/1 CST-HD47B shim gaps O
- System operability considered affected based on preliminar engineering evaluation.
y 1855 021 --~~. _ _