ML21295A247
| ML21295A247 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 10/18/2021 |
| From: | Darrell Roberts Engine Systems |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML21295A247 (7) | |
Text
1111 04:32:07 p.m. 10-18-2021 1 /7 ENGINE SYSTEMS, INC.
175 Freight Road Telephone: 252/9TT-2720 Rocky Mount, NC 27804 Fax: 252/446-1134 TELEFAX Date: October 18, 2021 Company: NRC Operations Center Fax Number: 301/816-5151 Verification No.: 301/816-5100
Reference:
Report No. 10CFR21-0132, Rev. 0 From: Dan Roberts Page: 1 of 7
Dear Sir/ Madam:
Following this cover is a copy of our report 10CFR21-0132, Rev. 0, for a 10CFR21 reportable notification on a pressure regulator valve, Nordberg P/N 1776 506.
A copy of this report will be mailed to the NRC Document Control Desk and to our affected nuclear customer.
Should you have questions, please let us know.
Sincerely, ENGINE SYSTEMS, INC.
a~
Dan Roberts Quality Manager Quality Performance With Pride
1111 04:32:21 p.m. 10-18-2021 217 ENGINE SYSTEMS, INC.
175 Freight Road, Rocky Mount, NC 27804 Telephone: 252/977-2720 Fax: 252/446-1134 Report No. 10CFR21-0132 Rev. O: 10/18/21 10CFR21 REPORTING OF DEFECTS AND NON-COMPLIANCE COMPONENT: Pressure Regulator Valve Nordberg P/N 1776 506 SYSTEM: Emergency Diesel Generator CONCLUSION: Reportable in Accordance With 10CFR21 Prepared By:
~,~ Engineering Manager Date: 1ol1&Lz1 Reviewed By: a. wLr Quality Assurance Manager Date: 10 LL ';f /'J. I Quality Performance With Pride
1111 04:32:33 p.m. 10-18-2021 3 /7 Report No. 10CFR21-0132 Record of Revisions Page: 1 of 1 REV DATE PAGE DESCRIPTION 0 10/18/21 Initial issue.
1111 04:32:41 p.m. 10-18-2021 417 Report No. 10CFR21-0132 Revision: 0 Date: 10/18/21 Page: 1 of 4 Pursuant to 10 CFR 21.21(d)(4l, ESI is presenting the required information as follows:
(i) Name and address of the individual or individuals informing the Commission.
John Kriesel Dan Roberts Engineering Manager Quality Manager Engine Systems Inc. Engine Systems Inc.
175 Freight Rd. 175 Freight Rd.
Rocky Mount, NC 27804 Rocky Mount, NC 27804 (ii) Identification of the basic component supplied within the United States which fails to comply or contains a defect.
Pressure Regulator Valve, Nordberg PIN 1776 506 (iii) Identification of the firm supplying the basic component which fails to comply or contains a defect.
Engine Systems Inc. (ES/)
(iv) Nature of the defect or failure to comply and the safety hazard which is created or could be created by such defect of failure to comply.
A pressure regulator valve installed on an emergency diesel generator at Brunswick Nuclear Plant (BNP), did not properly regulate starting air pressure and allowed equalization of inlet pressure to the outlet. Subsequent investigation by ES/ revealed a raised edge on the metal seating surface of the valve that caused the PTFE seat to tear. Equalization of starting air pressure is undesirable since it may inhibit operation the downstream starting air solenoid valve, thus compromising ability of the emergency diesel generator to start and support safety-related loads.
The valve is used at BNP to reduce 350 psig from the air receivers to 250 psi!!J which will be used for engine starting and turbo jet assist. During standby conditions, there is no flow through valve.
Admittance of starling air is controlled by a starting air solenoid valve that remains normally closed and opens upon receipt of a start signal. The solenoid valve is rated for a maximum differential pressure of 300 psi, therefore equalization of inlet pressure to the outlet may prevent the starting air solenoid valve from operating.
The pressure regulator valve is a Fisher brand assembly consisting of two main components: (1) the Type 310A main valve and (2) the Type 32A pilot. The flow of air travels through main valve. The pilot senses inlet and outlet pressures and provides feedback to open and close the main valve accordingly. In the main valve, air flows through a throttling sleeve and past a stationary valve plug.
When air flow is no longer required, the throttling sleeve seats against the valve plug. The throttling sleeve is a metal tube with a tapered seat at one end. The valve plug contains a PTFE seat upon which the throttle sleeve seals. See Figure 1 below.
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,*****/** I Figure 1 Overall View of Regulator Assembly ~.-.=fl=,,:-///./
1111 04:33:31 p.m. 10-18-2021 5 /7 Report No. 1 0CFR21-0132 Revision: a Date: 10/18/21 Page: 2of4 (v) The date on which the infonnation of such defect or failure to comply was obtained.
August 20, 2021 (vi) In the case of a basic component which contains a defect or fails to comply, the number and location of these components in use at, supplied for, being supplied for, or may be supplied for, manufactured, or being manufactured for one or more facilities or activities subject to the regulations in this part.
The extent of condition is this one part number (1776 506) supplied to one customer, Brunswick Nuclear Plant. ES/ is unable to limit the condition to a specific batch or lime frame, therefore any of the following valves may be affected:
ESIIWO Customer PO Qty S/N(s) ESI C of C Date 18143228 18143227 3003234 00319437 4 8/14/2007 18143229 18143226 3004128 00356888 1 18463611 5/1/2008 18838327 3005043 00400589 2 18838329(11 2/23/2009 (later 18951000) 19184569 3005733 00453448 2 11/17/2009 19184570 20400963 4/19/2012 3008907 00586294 3 20400964 5/18/2012 20400966 3009934 00622136 1 20776484 9/7/2012 20776485 3010544 00644942 2 2/11/2013 20776488 20776486 8/27/2013 20776487(21 R000180559 R000180556 3011506 685916 8 9/26/2013 R000180558 R000180560 R000245080 11/25/2013 R000245081 R059015844 8/4/2020 R059015845 3020679 3110953 4 R059015846 11/10/2020 R059015847 R059517688 3021309 3119315 2 1/15/2021 R059517689 Total Qty 29 Table 1: ESI Supply History of Pressure Regulator Valve P/N 1776 506 Notes: (1) This valve is the subject of report 10CFR21-0132.
(2) This valve was returned with SIN 18838329, inspected successfuf/y, and did not exhibit the same condition.
1111 04:33:54 p.m. 10-18-2021 6 /7 Report No. 10CFR21-0132 Revision: a Date: 10/18/21 Page: 3 of4 (vii) The corrective action which has been, is being, or will be taken; the name of the individual or organization responsible for the action; and the length of time that has been or will be taken to complete the action.
For Brunswick Nuclear Plant:
- For regulators installed:
BNP should continue to monitor the outlet pressure from the regulator and verify the inlet and outlet pressures have not equalized. Though ES/ performed functional testing on 100% of the regulators prior to shipment (which includes a downstream equalization test), it is believed that the in-service conditions which exercise the regulator with higher flow rates would quickly exacerbate the condition to a point at which failure would be readily apparent.
- For regulators in BNP inventory (not in service):
It is recommended that these regulators have an inspection performed either on-site or at ES/. This requires disassembling (splitting) the main valve body halves and removing the throttling sleeve/diaphragm assembly. A "feel" check is to be performed at the transition of the valve seat taper to the end of the sleeve for a smooth, rounded transition. No raised edge or burr is allowed.
When this inspection is performed, the PTFE seat should also be inspected for signs of fretting or tearing. Any signs of abnormality are cause for rejection and the component shall be reworked.
For ES/:
ES/ will add inspections to the dedication package for new and refurbished pressure regulator valves to verify a smooth, rounded transition at the valve seat of the throttling sleeve. This activity is underway and will be completed by November 15, 2021 and in all cases prior to future shipments.
(viii) Any advice related to the potential defect or failure to comply about the facility, activity, or basic component that has been, is being, or will be given to purchasers or licensees.
To aid in identifying the suspect components of the pressure regulating valve, photos depicting the areas of interest are provided on the following page.
1111 04:34:15p.m. 10-18-2021 717 Report No. 10CFR21-0132 Revision: 0 Date: 10/18/21 Page: 4 of4 Photo 5: Good Seat - Smooth, rounded transition Photo 6: Bad Seat - Raised edge at transition