SHANGHAI, Nov 29 (Reuters) - China's yuan touched a one-week high against the dollar on Monday, on corporate demand for the local currency and easing worries over the spread of the Omicron coronavirus variant.

First detected in Southern Africa, the new variant has spread around the world, with more countries imposing travel restrictions. But some domestic experts said the variant would not have a major impact on China for now due to the country's strict virus containment measures.

"The recent resurgence of new variant Omicron may be the catalyst for more supports to RMB assets given China's border is still largely closed to foreigners and its dynamic zero COVID strategy is still in place," said Tommy Xie, head of Greater China research at OCBC Bank.

Prior to market opening, the People's Bank of China (PBOC) set the midpoint rate at 6.3872 per dollar, the highest since Nov. 19 and 64 pips firmer than the previous fix of 6.3936.

In the spot market, the onshore yuan opened at 6.3850 per dollar and rose to a high of 6.3820 at one point, the strongest level since Nov. 22. At midday, it was changing hands at 6.3828, 102 pips firmer than the previous late session close.

The onshore yuan also looked set for a fourth straight monthly gain in November.

Traders said strong corporate demand for yuan and China's strict virus measures to quickly quell local outbreaks and travel restrictions should continue to provide support for the local currency.

Chinese companies usually have higher demand for the yuan towards the year-end and the subsequent long Lunar New Year holiday early in the year, prompting heavier conversion of their dollar receipts into the Chinese currency in recent months.

Separately, China's foreign exchange regulator said on Friday it would expand the scope of banks' foreign exchange derivatives business to guide companies to establish a risk-neutral mentality by hedging their FX risks.

By midday, the broad dollar index rose to 96.266 from the previous close of 96.198, while the offshore yuan was trading at 6.3832 per dollar.

The yuan market at 0400 GMT:

ONSHORE SPOT:

Key indexes:

*Divergence of the dollar/yuan exchange rate. Negative number indicates that spot yuan is trading stronger than the midpoint. The People's Bank of China (PBOC) allows the exchange rate to rise or fall 2% from official midpoint rate it sets each morning.

OFFSHORE CNH MARKET

*Premium for offshore spot over onshore

**Figure reflects difference from PBOC's official midpoint, since non-deliverable forwards are settled against the midpoint. .