05000321/LER-2022-001, Manual Reactor Scram Due to Reactor Pressure Perturbations
| ML22049B535 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 02/18/2022 |
| From: | Dean E Southern Nuclear Operating Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NL-22-0102 LER 2022-001-00 | |
| Download: ML22049B535 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(iv)(A), System Actuation |
| 3212022001R00 - NRC Website | |
text
. ~ Southern Nuclear February 18, 2022 Docket Nos.: 50-321 ATTN: Document Control Desk U. S. Nuclear Regulatory Commission Washington, D. C. 20555-0001 Edwin 0. Dean Ill Vice President - Plant Hatch Edwin I. Hatch Nuclear Plant - Unit 1 Licensee Event Report 2022-001-00 HelQh Nuclegr f')lenl 11028 Ha!Qh Perkwey North Baxley, QA 31613 912 63Hi869 !et 912 366 2077 fex NL-22-0102 Manual Reactor Scram due to Reactor Pressure Perturbations Ladies and Gentlemen:
In accordance with the requirements of 10 CFR 50.73(a)(2)(iv)(A), Southern Nuclear Operating Company hereby submits the enclosed Licensee Event Report.
This letter contains no NRC commitments. If you have any questions, please contact the Plant Hatch Licensing Manager, Jimmy Collins, at 912.453.2342.
Respectfully submitted,
/J ~.,
iJlVJ2~
Edwin D. Dean Ill Vice President - Plant Hatch ED/CJC Enclosure: LER-2022-001-00 Cc:
Regional Administrator - Region II NRR Project Manager - Plant Hatch Senior Resident Inspector - Plant Hatch RlYPE: CHA02.004
Edwin I. Hatch Nuclear Plant - Unit 1 Licensee Event Report 2022-001-00 Manual Scram due to Reactor Pressure Perturbations Enclosure LER 2022-001-00
LICENSEE ~VENT ijfEPORT (L~R)
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Pay On 12/29/2021 at i ~6i E~T, wHh Unlt 1 in Modt 1 ~t 90% pow~r. tl1e rf)}~etor wls m~nual!y tripp~d du~ io rem:tor pre5 ure perturbations. ih@ eau e of th~ rnactor pr~s5ure p~rturbations wr.1~ thi f~llurn of gj m&;lln ~tf§am !hmt11@ pr !'il'HJrt trij!nsmlttti:r, Addltkma!!y, e!osure of contalnmnt isolation valvef.l.(C!Vs) In mulUpl~ §y§tijm~ oceurrnd during th~ trip as &1 re ult of rnltlehlng the gctu~!ion s~tpolnt on rng1ctor wflt~r l~v~L Tl,.1 trip WlJ not comp!~x. wltl1 ~II ~y~t~m~ r~~pondir,g r--1CJnn~lly poij\\etrlp,
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LIC~N~~I; EVENT R~PORT (LER)
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EVENT DESCRIPTION
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- t 96% rnit~d tM~rmi l power. Al approximately '1000 EST, !he #1 main steam throttl@
prnssurn tramimitt~r [EIS~ Codes TA, PT] fillil~d, A! 1310 EST, tl1e main it!l:~l'l'l thmttl@ prnssurn Sipoint ;;1nd retiotor prli/ssurn b~gan to beeorn imatle. Rg1Q!or pow~r was low@rnd to 90!% powr. WHh rng.1ctor prnssurn:il st!ll unst~ble, fl manual §lC~AM Wf;JS ins~tl§)ci at 1SS:2. A!! ec.mtrnl rods fully lmi~r-t~d. A!l s@fo:!yer~!~t~d <'lctua!ions oceurred as desl9m~d As li:XP@cted aftl.llr a minual r!\\lilletor SCRAM, ~ Group II eonialnm~nt lsol@Uon o *curr~d wt1@n rnl',;lctor wiiiiti,;ir lev~l lowernd to thG !ow water lev~l :;;@ti:mint Ther wern no other inoper@bl@ §tr\\Jcluroo, ~y~t~r-n~. or cmnpon@nts that contribut~d to the event.
EVENT CAU~E ANAL Y@I~:
Th~ ~vent wfils d~t@rmirwd to be eausd by~ failure of a mair1 ~t@gjm thrnttl~ PfS~ure tr~rtsmiUer. Sp@olfl~@!ly, thij dijmping clrnultry within th~ trf)ri1unitter fail~d. This f!;l$Ulted in slgf'ls"JI @rror ln the prns~ur control e!rnultry, l@adlng to reactor prn5sure £eti::ioirit instabl!lty, RE~ORiAB!LlTY ANO SAFETY ASS~~-SMENT'.
This event is reportabliii pursuan to 10 CFR ~Q.73(a)(2)(fv)(A) due to th~ following systcrn ijCtu~tions:
Reactor Prot@ction Sy5tem (~PS) and g~mern! containment isol~tion $!9fl~lij @ffls!eting containment lsolition valves in morn than on systrn,
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Tl1re *were rio ~gf~ty consijqu@nces as a result o-f this ev~nt Ttl~r~ Wire nc ifety~r~l2ted systQtTIS th~lt failed dvring this I ewmt. rt,e operating crnw rnspond@d correctly to the event. The ~pplic~b!~ filbnorrmil/~rn~rg~n~y opernt1F19 procedur@s 1
1 w~re er,ternd. Tl,e ~v~nt ws1s witr1ln tl'rn !l!f1i!ysis ofth@ Updatijd Fin~! ~~f~ty AMly~is R~port {UfijA~) Ct1apter 15, I
No rndlologicg1! rnle~~~ occurrnd du~ to this ~mmt.
I CORRECTIVE AC'flONS:
PREVIOUS SIMILAR EVENTS; None.
of 2